| Message ID | 20200928170901.707554-1-Anna.Schumaker@Netapp.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | NFSD: Add support for the v4.2 READ_PLUS operation | expand |
On Mon, Sep 28, 2020 at 01:08:56PM -0400, schumaker.anna@gmail.com wrote: > From: Anna Schumaker <Anna.Schumaker@Netapp.com> > > These patches add server support for the READ_PLUS operation, which > breaks read requests into several "data" and "hole" segments when > replying to the client. > > - Changes since v5: > - Set the right buffer size through svc_reserve() > - Fix up nfsd4_read_plus_rsize() to make sure we have enough buffer > - Limit maxcount to the amount of buffer space when encoding data > - Bail out of unexpected hole values by encoding a data segment > - Rebase to v5.9-rc7 I'll give the patches another once over, but I think those were my remaining concerns. Except for the btrfs regression. I guess it's just a btrfs bug. At this point I'm willing to go ahead and merge this anyway if nobody objects. Might be nice to try giving them a heads up again, though. --b. > Here are the results of some performance tests I ran on some lab > machines. I tested by reading various 2G files from a few different underlying > filesystems and across several NFS versions. I used the `vmtouch` utility > to make sure files were only cached when we wanted them to be. In addition > to 100% data and 100% hole cases, I also tested with files that alternate > between data and hole segments. These files have either 4K, 8K, 16K, or 32K > segment sizes and start with either data or hole segments. So the file > mixed-4d has a 4K segment size beginning with a data segment, but mixed-32h > has 32K segments beginning with a hole. The units are in seconds, with the > first number for each NFS version being the uncached read time and the second > number is for when the file is cached on the server. > > I added some extra data collection (client cpu percentage and sys time), > but the extra data means I couldn't figure out a way to break this down > into a concise table. I cut out v3 and v4.0 performance numbers to get > the size down, but I kept v4.1 for comparison because it uses the same > code that v4.2 without read plus uses. > > > Read Plus Results (ext4): > data > :... v4.1 ... Uncached ... 20.540 s, 105 MB/s, 0.65 s kern, 3% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 20.605 s, 104 MB/s, 0.65 s kern, 3% cpu > :....... Cached ..... 18.253 s, 118 MB/s, 0.67 s kern, 3% cpu > hole > :... v4.1 ... Uncached ... 18.255 s, 118 MB/s, 0.72 s kern, 3% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu > :... v4.2 ... Uncached ... 0.847 s, 2.5 GB/s, 0.73 s kern, 86% cpu > :....... Cached ..... 0.845 s, 2.5 GB/s, 0.72 s kern, 85% cpu > mixed-4d > :... v4.1 ... Uncached ... 54.691 s, 39 MB/s, 0.75 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 51.587 s, 42 MB/s, 0.75 s kern, 1% cpu > :....... Cached ..... 9.215 s, 233 MB/s, 0.67 s kern, 7% cpu > mixed-8d > :... v4.1 ... Uncached ... 37.072 s, 58 MB/s, 0.67 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 33.259 s, 65 MB/s, 0.68 s kern, 2% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.67 s kern, 7% cpu > mixed-16d > :... v4.1 ... Uncached ... 27.138 s, 79 MB/s, 0.73 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 23.042 s, 93 MB/s, 0.73 s kern, 3% cpu > :....... Cached ..... 9.150 s, 235 MB/s, 0.66 s kern, 7% cpu > mixed-32d > :... v4.1 ... Uncached ... 25.326 s, 85 MB/s, 0.68 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 21.125 s, 102 MB/s, 0.69 s kern, 3% cpu > :....... Cached ..... 9.140 s, 235 MB/s, 0.67 s kern, 7% cpu > mixed-4h > :... v4.1 ... Uncached ... 58.317 s, 37 MB/s, 0.75 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 51.878 s, 41 MB/s, 0.74 s kern, 1% cpu > :....... Cached ..... 9.215 s, 233 MB/s, 0.68 s kern, 7% cpu > mixed-8h > :... v4.1 ... Uncached ... 36.855 s, 58 MB/s, 0.68 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu > :... v4.2 ... Uncached ... 29.457 s, 73 MB/s, 0.68 s kern, 2% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.67 s kern, 7% cpu > mixed-16h > :... v4.1 ... Uncached ... 26.460 s, 81 MB/s, 0.74 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 19.587 s, 110 MB/s, 0.74 s kern, 3% cpu > :....... Cached ..... 9.150 s, 235 MB/s, 0.67 s kern, 7% cpu > mixed-32h > :... v4.1 ... Uncached ... 25.495 s, 84 MB/s, 0.69 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.65 s kern, 3% cpu > :... v4.2 ... Uncached ... 17.634 s, 122 MB/s, 0.69 s kern, 3% cpu > :....... Cached ..... 9.140 s, 235 MB/s, 0.68 s kern, 7% cpu > > > > Read Plus Results (xfs): > data > :... v4.1 ... Uncached ... 20.230 s, 106 MB/s, 0.65 s kern, 3% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu > :... v4.2 ... Uncached ... 20.724 s, 104 MB/s, 0.65 s kern, 3% cpu > :....... Cached ..... 18.253 s, 118 MB/s, 0.67 s kern, 3% cpu > hole > :... v4.1 ... Uncached ... 18.255 s, 118 MB/s, 0.68 s kern, 3% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.69 s kern, 3% cpu > :... v4.2 ... Uncached ... 0.904 s, 2.4 GB/s, 0.72 s kern, 79% cpu > :....... Cached ..... 0.908 s, 2.4 GB/s, 0.73 s kern, 80% cpu > mixed-4d > :... v4.1 ... Uncached ... 57.553 s, 37 MB/s, 0.77 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 37.162 s, 58 MB/s, 0.73 s kern, 1% cpu > :....... Cached ..... 9.215 s, 233 MB/s, 0.67 s kern, 7% cpu > mixed-8d > :... v4.1 ... Uncached ... 36.754 s, 58 MB/s, 0.69 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu > :... v4.2 ... Uncached ... 24.454 s, 88 MB/s, 0.69 s kern, 2% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.66 s kern, 7% cpu > mixed-16d > :... v4.1 ... Uncached ... 27.156 s, 79 MB/s, 0.73 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 22.934 s, 94 MB/s, 0.72 s kern, 3% cpu > :....... Cached ..... 9.150 s, 235 MB/s, 0.68 s kern, 7% cpu > mixed-32d > :... v4.1 ... Uncached ... 27.849 s, 77 MB/s, 0.68 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu > :... v4.2 ... Uncached ... 23.670 s, 91 MB/s, 0.67 s kern, 2% cpu > :....... Cached ..... 9.139 s, 235 MB/s, 0.64 s kern, 7% cpu > mixed-4h > :... v4.1 ... Uncached ... 57.639 s, 37 MB/s, 0.72 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.69 s kern, 3% cpu > :... v4.2 ... Uncached ... 35.503 s, 61 MB/s, 0.72 s kern, 2% cpu > :....... Cached ..... 9.215 s, 233 MB/s, 0.66 s kern, 7% cpu > mixed-8h > :... v4.1 ... Uncached ... 37.044 s, 58 MB/s, 0.71 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu > :... v4.2 ... Uncached ... 23.779 s, 90 MB/s, 0.69 s kern, 2% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.65 s kern, 7% cpu > mixed-16h > :... v4.1 ... Uncached ... 27.167 s, 79 MB/s, 0.73 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.67 s kern, 3% cpu > :... v4.2 ... Uncached ... 19.088 s, 113 MB/s, 0.75 s kern, 3% cpu > :....... Cached ..... 9.159 s, 234 MB/s, 0.66 s kern, 7% cpu > mixed-32h > :... v4.1 ... Uncached ... 27.592 s, 78 MB/s, 0.71 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu > :... v4.2 ... Uncached ... 19.682 s, 109 MB/s, 0.67 s kern, 3% cpu > :....... Cached ..... 9.140 s, 235 MB/s, 0.67 s kern, 7% cpu > > > > Read Plus Results (btrfs): > data > :... v4.1 ... Uncached ... 21.317 s, 101 MB/s, 0.63 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.67 s kern, 3% cpu > :... v4.2 ... Uncached ... 28.665 s, 75 MB/s, 0.65 s kern, 2% cpu > :....... Cached ..... 18.253 s, 118 MB/s, 0.66 s kern, 3% cpu > hole > :... v4.1 ... Uncached ... 18.256 s, 118 MB/s, 0.70 s kern, 3% cpu > : :....... Cached ..... 18.254 s, 118 MB/s, 0.73 s kern, 4% cpu > :... v4.2 ... Uncached ... 0.851 s, 2.5 GB/s, 0.72 s kern, 84% cpu > :....... Cached ..... 0.847 s, 2.5 GB/s, 0.73 s kern, 86% cpu > mixed-4d > :... v4.1 ... Uncached ... 56.857 s, 38 MB/s, 0.76 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu > :... v4.2 ... Uncached ... 54.455 s, 39 MB/s, 0.73 s kern, 1% cpu > :....... Cached ..... 9.215 s, 233 MB/s, 0.68 s kern, 7% cpu > mixed-8d > :... v4.1 ... Uncached ... 36.641 s, 59 MB/s, 0.68 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 33.205 s, 65 MB/s, 0.67 s kern, 2% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.65 s kern, 7% cpu > mixed-16d > :... v4.1 ... Uncached ... 28.653 s, 75 MB/s, 0.72 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 25.748 s, 83 MB/s, 0.71 s kern, 2% cpu > :....... Cached ..... 9.150 s, 235 MB/s, 0.64 s kern, 7% cpu > mixed-32d > :... v4.1 ... Uncached ... 28.886 s, 74 MB/s, 0.67 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu > :... v4.2 ... Uncached ... 24.724 s, 87 MB/s, 0.74 s kern, 2% cpu > :....... Cached ..... 9.140 s, 235 MB/s, 0.63 s kern, 6% cpu > mixed-4h > :... v4.1 ... Uncached ... 52.181 s, 41 MB/s, 0.73 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.66 s kern, 3% cpu > :... v4.2 ... Uncached ... 150.341 s, 14 MB/s, 0.72 s kern, 0% cpu > :....... Cached ..... 9.216 s, 233 MB/s, 0.63 s kern, 6% cpu > mixed-8h > :... v4.1 ... Uncached ... 36.945 s, 58 MB/s, 0.68 s kern, 1% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.65 s kern, 3% cpu > :... v4.2 ... Uncached ... 79.781 s, 27 MB/s, 0.68 s kern, 0% cpu > :....... Cached ..... 9.172 s, 234 MB/s, 0.66 s kern, 7% cpu > mixed-16h > :... v4.1 ... Uncached ... 28.651 s, 75 MB/s, 0.73 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.66 s kern, 3% cpu > :... v4.2 ... Uncached ... 47.428 s, 45 MB/s, 0.71 s kern, 1% cpu > :....... Cached ..... 9.150 s, 235 MB/s, 0.67 s kern, 7% cpu > mixed-32h > :... v4.1 ... Uncached ... 28.618 s, 75 MB/s, 0.69 s kern, 2% cpu > : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu > :... v4.2 ... Uncached ... 38.813 s, 55 MB/s, 0.67 s kern, 1% cpu > :....... Cached ..... 9.140 s, 235 MB/s, 0.61 s kern, 6% cpu > > > Thoughts? > Anna > > > Anna Schumaker (5): > SUNRPC/NFSD: Implement xdr_reserve_space_vec() > NFSD: Add READ_PLUS data support > NFSD: Add READ_PLUS hole segment encoding > NFSD: Return both a hole and a data segment > NFSD: Encode a full READ_PLUS reply > > fs/nfsd/nfs4proc.c | 21 +++++ > fs/nfsd/nfs4xdr.c | 177 +++++++++++++++++++++++++++++++------ > include/linux/sunrpc/xdr.h | 2 + > net/sunrpc/xdr.c | 45 ++++++++++ > 4 files changed, 217 insertions(+), 28 deletions(-) > > -- > 2.28.0 >
From: Anna Schumaker <Anna.Schumaker@Netapp.com> These patches add server support for the READ_PLUS operation, which breaks read requests into several "data" and "hole" segments when replying to the client. - Changes since v5: - Set the right buffer size through svc_reserve() - Fix up nfsd4_read_plus_rsize() to make sure we have enough buffer - Limit maxcount to the amount of buffer space when encoding data - Bail out of unexpected hole values by encoding a data segment - Rebase to v5.9-rc7 Here are the results of some performance tests I ran on some lab machines. I tested by reading various 2G files from a few different underlying filesystems and across several NFS versions. I used the `vmtouch` utility to make sure files were only cached when we wanted them to be. In addition to 100% data and 100% hole cases, I also tested with files that alternate between data and hole segments. These files have either 4K, 8K, 16K, or 32K segment sizes and start with either data or hole segments. So the file mixed-4d has a 4K segment size beginning with a data segment, but mixed-32h has 32K segments beginning with a hole. The units are in seconds, with the first number for each NFS version being the uncached read time and the second number is for when the file is cached on the server. I added some extra data collection (client cpu percentage and sys time), but the extra data means I couldn't figure out a way to break this down into a concise table. I cut out v3 and v4.0 performance numbers to get the size down, but I kept v4.1 for comparison because it uses the same code that v4.2 without read plus uses. Read Plus Results (ext4): data :... v4.1 ... Uncached ... 20.540 s, 105 MB/s, 0.65 s kern, 3% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 20.605 s, 104 MB/s, 0.65 s kern, 3% cpu :....... Cached ..... 18.253 s, 118 MB/s, 0.67 s kern, 3% cpu hole :... v4.1 ... Uncached ... 18.255 s, 118 MB/s, 0.72 s kern, 3% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu :... v4.2 ... Uncached ... 0.847 s, 2.5 GB/s, 0.73 s kern, 86% cpu :....... Cached ..... 0.845 s, 2.5 GB/s, 0.72 s kern, 85% cpu mixed-4d :... v4.1 ... Uncached ... 54.691 s, 39 MB/s, 0.75 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 51.587 s, 42 MB/s, 0.75 s kern, 1% cpu :....... Cached ..... 9.215 s, 233 MB/s, 0.67 s kern, 7% cpu mixed-8d :... v4.1 ... Uncached ... 37.072 s, 58 MB/s, 0.67 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 33.259 s, 65 MB/s, 0.68 s kern, 2% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.67 s kern, 7% cpu mixed-16d :... v4.1 ... Uncached ... 27.138 s, 79 MB/s, 0.73 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 23.042 s, 93 MB/s, 0.73 s kern, 3% cpu :....... Cached ..... 9.150 s, 235 MB/s, 0.66 s kern, 7% cpu mixed-32d :... v4.1 ... Uncached ... 25.326 s, 85 MB/s, 0.68 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 21.125 s, 102 MB/s, 0.69 s kern, 3% cpu :....... Cached ..... 9.140 s, 235 MB/s, 0.67 s kern, 7% cpu mixed-4h :... v4.1 ... Uncached ... 58.317 s, 37 MB/s, 0.75 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 51.878 s, 41 MB/s, 0.74 s kern, 1% cpu :....... Cached ..... 9.215 s, 233 MB/s, 0.68 s kern, 7% cpu mixed-8h :... v4.1 ... Uncached ... 36.855 s, 58 MB/s, 0.68 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu :... v4.2 ... Uncached ... 29.457 s, 73 MB/s, 0.68 s kern, 2% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.67 s kern, 7% cpu mixed-16h :... v4.1 ... Uncached ... 26.460 s, 81 MB/s, 0.74 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 19.587 s, 110 MB/s, 0.74 s kern, 3% cpu :....... Cached ..... 9.150 s, 235 MB/s, 0.67 s kern, 7% cpu mixed-32h :... v4.1 ... Uncached ... 25.495 s, 84 MB/s, 0.69 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.65 s kern, 3% cpu :... v4.2 ... Uncached ... 17.634 s, 122 MB/s, 0.69 s kern, 3% cpu :....... Cached ..... 9.140 s, 235 MB/s, 0.68 s kern, 7% cpu Read Plus Results (xfs): data :... v4.1 ... Uncached ... 20.230 s, 106 MB/s, 0.65 s kern, 3% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu :... v4.2 ... Uncached ... 20.724 s, 104 MB/s, 0.65 s kern, 3% cpu :....... Cached ..... 18.253 s, 118 MB/s, 0.67 s kern, 3% cpu hole :... v4.1 ... Uncached ... 18.255 s, 118 MB/s, 0.68 s kern, 3% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.69 s kern, 3% cpu :... v4.2 ... Uncached ... 0.904 s, 2.4 GB/s, 0.72 s kern, 79% cpu :....... Cached ..... 0.908 s, 2.4 GB/s, 0.73 s kern, 80% cpu mixed-4d :... v4.1 ... Uncached ... 57.553 s, 37 MB/s, 0.77 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 37.162 s, 58 MB/s, 0.73 s kern, 1% cpu :....... Cached ..... 9.215 s, 233 MB/s, 0.67 s kern, 7% cpu mixed-8d :... v4.1 ... Uncached ... 36.754 s, 58 MB/s, 0.69 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu :... v4.2 ... Uncached ... 24.454 s, 88 MB/s, 0.69 s kern, 2% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.66 s kern, 7% cpu mixed-16d :... v4.1 ... Uncached ... 27.156 s, 79 MB/s, 0.73 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 22.934 s, 94 MB/s, 0.72 s kern, 3% cpu :....... Cached ..... 9.150 s, 235 MB/s, 0.68 s kern, 7% cpu mixed-32d :... v4.1 ... Uncached ... 27.849 s, 77 MB/s, 0.68 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu :... v4.2 ... Uncached ... 23.670 s, 91 MB/s, 0.67 s kern, 2% cpu :....... Cached ..... 9.139 s, 235 MB/s, 0.64 s kern, 7% cpu mixed-4h :... v4.1 ... Uncached ... 57.639 s, 37 MB/s, 0.72 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.69 s kern, 3% cpu :... v4.2 ... Uncached ... 35.503 s, 61 MB/s, 0.72 s kern, 2% cpu :....... Cached ..... 9.215 s, 233 MB/s, 0.66 s kern, 7% cpu mixed-8h :... v4.1 ... Uncached ... 37.044 s, 58 MB/s, 0.71 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu :... v4.2 ... Uncached ... 23.779 s, 90 MB/s, 0.69 s kern, 2% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.65 s kern, 7% cpu mixed-16h :... v4.1 ... Uncached ... 27.167 s, 79 MB/s, 0.73 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.67 s kern, 3% cpu :... v4.2 ... Uncached ... 19.088 s, 113 MB/s, 0.75 s kern, 3% cpu :....... Cached ..... 9.159 s, 234 MB/s, 0.66 s kern, 7% cpu mixed-32h :... v4.1 ... Uncached ... 27.592 s, 78 MB/s, 0.71 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.68 s kern, 3% cpu :... v4.2 ... Uncached ... 19.682 s, 109 MB/s, 0.67 s kern, 3% cpu :....... Cached ..... 9.140 s, 235 MB/s, 0.67 s kern, 7% cpu Read Plus Results (btrfs): data :... v4.1 ... Uncached ... 21.317 s, 101 MB/s, 0.63 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.67 s kern, 3% cpu :... v4.2 ... Uncached ... 28.665 s, 75 MB/s, 0.65 s kern, 2% cpu :....... Cached ..... 18.253 s, 118 MB/s, 0.66 s kern, 3% cpu hole :... v4.1 ... Uncached ... 18.256 s, 118 MB/s, 0.70 s kern, 3% cpu : :....... Cached ..... 18.254 s, 118 MB/s, 0.73 s kern, 4% cpu :... v4.2 ... Uncached ... 0.851 s, 2.5 GB/s, 0.72 s kern, 84% cpu :....... Cached ..... 0.847 s, 2.5 GB/s, 0.73 s kern, 86% cpu mixed-4d :... v4.1 ... Uncached ... 56.857 s, 38 MB/s, 0.76 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.72 s kern, 3% cpu :... v4.2 ... Uncached ... 54.455 s, 39 MB/s, 0.73 s kern, 1% cpu :....... Cached ..... 9.215 s, 233 MB/s, 0.68 s kern, 7% cpu mixed-8d :... v4.1 ... Uncached ... 36.641 s, 59 MB/s, 0.68 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 33.205 s, 65 MB/s, 0.67 s kern, 2% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.65 s kern, 7% cpu mixed-16d :... v4.1 ... Uncached ... 28.653 s, 75 MB/s, 0.72 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 25.748 s, 83 MB/s, 0.71 s kern, 2% cpu :....... Cached ..... 9.150 s, 235 MB/s, 0.64 s kern, 7% cpu mixed-32d :... v4.1 ... Uncached ... 28.886 s, 74 MB/s, 0.67 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.71 s kern, 3% cpu :... v4.2 ... Uncached ... 24.724 s, 87 MB/s, 0.74 s kern, 2% cpu :....... Cached ..... 9.140 s, 235 MB/s, 0.63 s kern, 6% cpu mixed-4h :... v4.1 ... Uncached ... 52.181 s, 41 MB/s, 0.73 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.66 s kern, 3% cpu :... v4.2 ... Uncached ... 150.341 s, 14 MB/s, 0.72 s kern, 0% cpu :....... Cached ..... 9.216 s, 233 MB/s, 0.63 s kern, 6% cpu mixed-8h :... v4.1 ... Uncached ... 36.945 s, 58 MB/s, 0.68 s kern, 1% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.65 s kern, 3% cpu :... v4.2 ... Uncached ... 79.781 s, 27 MB/s, 0.68 s kern, 0% cpu :....... Cached ..... 9.172 s, 234 MB/s, 0.66 s kern, 7% cpu mixed-16h :... v4.1 ... Uncached ... 28.651 s, 75 MB/s, 0.73 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.66 s kern, 3% cpu :... v4.2 ... Uncached ... 47.428 s, 45 MB/s, 0.71 s kern, 1% cpu :....... Cached ..... 9.150 s, 235 MB/s, 0.67 s kern, 7% cpu mixed-32h :... v4.1 ... Uncached ... 28.618 s, 75 MB/s, 0.69 s kern, 2% cpu : :....... Cached ..... 18.252 s, 118 MB/s, 0.70 s kern, 3% cpu :... v4.2 ... Uncached ... 38.813 s, 55 MB/s, 0.67 s kern, 1% cpu :....... Cached ..... 9.140 s, 235 MB/s, 0.61 s kern, 6% cpu Thoughts? Anna Anna Schumaker (5): SUNRPC/NFSD: Implement xdr_reserve_space_vec() NFSD: Add READ_PLUS data support NFSD: Add READ_PLUS hole segment encoding NFSD: Return both a hole and a data segment NFSD: Encode a full READ_PLUS reply fs/nfsd/nfs4proc.c | 21 +++++ fs/nfsd/nfs4xdr.c | 177 +++++++++++++++++++++++++++++++------ include/linux/sunrpc/xdr.h | 2 + net/sunrpc/xdr.c | 45 ++++++++++ 4 files changed, 217 insertions(+), 28 deletions(-)