results with diff affinity settings using ixgbe
From: Paweł Staszewski <hidden>
Date: 2009-01-27 15:14:25
I make some tests with affinity on my machine with some traffic load. If someone want look: Traffic in all test was 350Mbit/s TX and the same on RX RX queues on cpu6 / TX queues on cpu7 / intel e1000e on cpu4 Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s Average: all 0.05 0.00 0.00 0.00 1.89 10.03 0.00 88.03 221511.70 Average: 0 0.40 0.00 0.00 0.00 0.00 0.00 0.00 99.60 0.70 Average: 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.80 Average: 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.70 Average: 3 0.00 0.00 0.10 0.00 0.00 0.40 0.00 99.50 0.70 Average: 4 0.00 0.00 0.00 0.00 2.06 18.74 0.00 79.20 12870.50 Average: 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.30 Average: 6 0.00 0.00 0.00 0.00 2.65 57.49 0.00 39.86 59410.60 Average: 7 0.00 0.00 0.00 0.00 10.50 5.00 0.00 84.50 53977.90 RX queues on cpu6 / TX queues on cpu7 / intel e1000e on cpu1 Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s Average: all 0.08 0.00 0.09 0.00 0.75 14.24 0.00 84.84 215755.20 Average: 0 0.50 0.00 0.00 0.00 0.00 0.00 0.00 99.50 1.30 Average: 1 0.00 0.00 0.53 0.00 2.34 36.91 0.00 60.21 9771.90 Average: 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.40 Average: 3 0.00 0.00 0.00 0.00 0.00 0.20 0.00 99.80 1.30 Average: 4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.30 Average: 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.80 Average: 6 0.00 0.00 0.20 0.00 2.65 78.51 0.00 18.64 54691.70 Average: 7 0.00 0.00 0.00 0.00 1.03 0.51 0.00 98.46 54060.60 All RX/TX queues from ixgbe on one cpu7 / intel e1000e on cpu1 Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s Average: all 0.07 0.00 0.10 0.00 1.19 9.44 0.00 89.19 210155.50 Average: 0 0.60 0.00 0.00 0.00 0.00 0.00 0.00 99.40 0.60 Average: 1 0.00 0.00 0.41 0.00 2.87 16.27 0.00 80.45 13045.30 Average: 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.70 Average: 3 0.10 0.00 0.30 0.00 0.00 0.20 0.00 99.40 0.60 Average: 4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.70 Average: 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.10 Average: 6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.60 Average: 7 0.00 0.00 0.10 0.00 6.77 60.00 0.00 33.13 107242.50 All RX/TX queues from ixgbe on one cpu7 / intel e1000e on cpu4 Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s Average: all 0.05 0.00 0.04 0.00 1.24 9.55 0.00 89.12 212186.90 Average: 0 0.40 0.00 0.00 0.00 0.00 0.00 0.00 99.60 2.20 Average: 1 0.10 0.00 0.00 0.00 0.00 0.00 0.00 99.90 2.30 Average: 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 2.20 Average: 3 0.00 0.00 0.00 0.00 0.00 0.30 0.00 99.70 2.20 Average: 4 0.00 0.00 0.00 0.00 1.03 14.68 0.00 84.28 11965.50 Average: 5 0.00 0.00 0.10 0.00 0.00 0.00 0.00 99.90 2.80 Average: 6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 2.30 Average: 7 0.00 0.00 0.20 0.00 8.97 62.69 0.00 28.13 110943.50 Affinity set to "ffffffff" / and intel e1000e is on cpu4 Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s Average: all 0.10 0.00 0.14 0.01 1.16 15.07 0.00 83.52 185043.10 Average: 0 0.00 0.00 0.00 0.10 2.90 36.90 0.00 60.10 9008.60 Average: 1 0.00 0.00 0.10 0.00 2.30 28.36 0.00 69.24 9009.10 Average: 2 0.80 0.00 0.40 0.00 0.50 13.76 0.00 84.54 9008.90 Average: 3 0.00 0.00 0.20 0.00 0.20 4.61 0.00 94.98 9008.90 Average: 4 0.00 0.00 0.10 0.00 2.35 19.55 0.00 77.99 14142.10 Average: 5 0.00 0.00 0.10 0.00 0.20 3.85 0.00 95.84 9009.10 Average: 6 0.00 0.00 0.10 0.00 0.40 4.22 0.00 95.28 9008.90 Average: 7 0.00 0.00 0.10 0.00 0.51 8.69 0.00 90.70 9009.00 And if i split more RX/TX queues to different CPU-s i have more load done by: CPU: Core 2, speed 2999.98 MHz (estimated) Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000 samples % image name app name symbol name 458001 29.5565 vmlinux vmlinux native_read_tsc If all interrupts are on one CPU i have the best results So for me the best is to put ixgbe work on one CPU or make affinity to balance over all cpus But something is wrong with my intel e1000e because if i put intel e1000e with ixgbe on the same CPU system have 100% cpu load and all hangs.