diff mbox

[2/2] ixgbe: Use core to device locality interface

Message ID 1450864901-16712-2-git-send-email-daniel@numascale.com (mailing list archive)
State New, archived
Headers show

Commit Message

Daniel J Blueman Dec. 23, 2015, 10:01 a.m. UTC
Rather than assuming cores starting from 0 are local to the ethernet
device, use the introduced interface to find near cores.

Not only does this improve performance due to spreading interrupts via near
NUMA nodes, it prevents assigning cores on distant NUMA nodes, which aren't
reachable by device interrupts due to the 8-bit APIC ID limitation.

With Numascale NumaConnect2 systems with Intel ixgbe cards on
non-primary PCI domains, all ixgbe NICs would previously revector
interrupts to cores 0 to 63 (cores 0 to 47 would be considered
near the primary PCI domain). Now, cores 48 to 95 are used, increasing
performance and addressing interrupt delivery issues:

do_IRQ: 79.180 No irq handler for vector (irq -1)
do_IRQ: 78.42 No irq handler for vector (irq -1)
do_IRQ: 71.172 No irq handler for vector (irq -1)
do_IRQ: 70.236 No irq handler for vector (irq -1)
do_IRQ: 69.109 No irq handler for vector (irq -1)
do_IRQ: 68.189 No irq handler for vector (irq -1)
do_IRQ: 72.92 No irq handler for vector (irq -1)
do_IRQ: 73.235 No irq handler for vector (irq -1)
do_IRQ: 66.185 No irq handler for vector (irq -1)
do_IRQ: 67.62 No irq handler for vector (irq -1)
do_IRQ: 197 callbacks suppressed

Signed-off-by: Daniel J Blueman <daniel@numascale.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--
2.5.0

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Comments

kernel test robot Dec. 23, 2015, 11:15 a.m. UTC | #1
Hi Daniel,

[auto build test ERROR on pci/next]
[also build test ERROR on v4.4-rc6 next-20151223]

url:    https://github.com/0day-ci/linux/commits/Daniel-J-Blueman/PCI-Add-mechanism-to-find-topologically-near-cores/20151223-181947
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: i386-randconfig-a0-12222034 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "cpu_near_dev" [drivers/net/ethernet/intel/ixgbe/ixgbe.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
index f3168bc..12c4ce1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
@@ -817,10 +817,8 @@  static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter,
 	if ((tcs <= 1) && !(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) {
 		u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
 		if (rss_i > 1 && adapter->atr_sample_rate) {
-			if (cpu_online(v_idx)) {
-				cpu = v_idx;
-				node = cpu_to_node(cpu);
-			}
+			cpu = cpu_near_dev(adapter->pdev, v_idx);
+			node = cpu_to_node(cpu);
 		}
 	}