| Message ID | 20200921144957.979989-1-lvivier@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | migration: increase max-bandwidth to 128 MiB/s (1 Gib/s) | expand |
On Mon, Sep 21, 2020 at 04:49:57PM +0200, Laurent Vivier wrote: > max-bandwidth is set by default to 32 MiB/s (256 Mib/s) > since 2008 (5bb7910af031c). > > Most of the CPUs can dirty memory faster than that now, > and this is clearly a problem with POWER where the page > size is 64 kiB and not 4 KiB. > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> > --- > migration/migration.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/migration/migration.c b/migration/migration.c > index 58a5452471f9..1c4174947181 100644 > --- a/migration/migration.c > +++ b/migration/migration.c > @@ -57,7 +57,7 @@ > #include "qemu/queue.h" > #include "multifd.h" > > -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ > +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ > > /* Amount of time to allocate to each "chunk" of bandwidth-throttled > * data. */
On Mon, 21 Sep 2020 16:49:57 +0200 Laurent Vivier <lvivier@redhat.com> wrote: > max-bandwidth is set by default to 32 MiB/s (256 Mib/s) > since 2008 (5bb7910af031c). > > Most of the CPUs can dirty memory faster than that now, > and this is clearly a problem with POWER where the page > size is 64 kiB and not 4 KiB. > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> > --- Reviewed-by: Greg Kurz <groug@kaod.org> > migration/migration.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/migration/migration.c b/migration/migration.c > index 58a5452471f9..1c4174947181 100644 > --- a/migration/migration.c > +++ b/migration/migration.c > @@ -57,7 +57,7 @@ > #include "qemu/queue.h" > #include "multifd.h" > > -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ > +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ > > /* Amount of time to allocate to each "chunk" of bandwidth-throttled > * data. */
* Laurent Vivier (lvivier@redhat.com) wrote: > max-bandwidth is set by default to 32 MiB/s (256 Mib/s) > since 2008 (5bb7910af031c). > > Most of the CPUs can dirty memory faster than that now, > and this is clearly a problem with POWER where the page > size is 64 kiB and not 4 KiB. > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> Thanks, Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> in another 12 years we can increase it by 8x again! > --- > migration/migration.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/migration/migration.c b/migration/migration.c > index 58a5452471f9..1c4174947181 100644 > --- a/migration/migration.c > +++ b/migration/migration.c > @@ -57,7 +57,7 @@ > #include "qemu/queue.h" > #include "multifd.h" > > -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ > +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ > > /* Amount of time to allocate to each "chunk" of bandwidth-throttled > * data. */ > -- > 2.26.2 >
* Laurent Vivier (lvivier@redhat.com) wrote: > max-bandwidth is set by default to 32 MiB/s (256 Mib/s) > since 2008 (5bb7910af031c). > > Most of the CPUs can dirty memory faster than that now, > and this is clearly a problem with POWER where the page > size is 64 kiB and not 4 KiB. > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> Queued > --- > migration/migration.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/migration/migration.c b/migration/migration.c > index 58a5452471f9..1c4174947181 100644 > --- a/migration/migration.c > +++ b/migration/migration.c > @@ -57,7 +57,7 @@ > #include "qemu/queue.h" > #include "multifd.h" > > -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ > +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ > > /* Amount of time to allocate to each "chunk" of bandwidth-throttled > * data. */ > -- > 2.26.2 > >
diff --git a/migration/migration.c b/migration/migration.c index 58a5452471f9..1c4174947181 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -57,7 +57,7 @@ #include "qemu/queue.h" #include "multifd.h" -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ /* Amount of time to allocate to each "chunk" of bandwidth-throttled * data. */
max-bandwidth is set by default to 32 MiB/s (256 Mib/s) since 2008 (5bb7910af031c). Most of the CPUs can dirty memory faster than that now, and this is clearly a problem with POWER where the page size is 64 kiB and not 4 KiB. Signed-off-by: Laurent Vivier <lvivier@redhat.com> --- migration/migration.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)