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Date: Fri, 24 Apr 2009 16:10:35 -0400 (EDT) From: Christoph Lameter <cl@...ux.com> To: Eric Dumazet <dada1@...mosbay.com> cc: jesse.brandeburg@...el.com, netdev@...r.kernel.org, bhutchiings@...arflare.com, mchan@...adcom.com, David Miller <davem@...emloft.net> Subject: udp ping pong with various process bindings (and correct cpu mappings) Here are the results of a 40 byte udpping (http://gentwo.org/ll) run on kernel from 2.6.22 to 2.6.30-rc3 on a Dell 1950 dual quad core 3.3Ghz. One system fixed 2.6.22 kernel version on the other are varied. Nice graph at http://gentwo.org/results/udpping-results.pdf Summary: - Loss of ~1.5usec on fastest path (same cpu) since 2.6.22 - Different cpu same core looses 2-3 usecs vs. same cpu - Different cpu different core looses ~ 8 usecs vs same cpu - Maximum is usual if threads are on different sockets but sometimes the same socket different core is worse (2.6.26/2.6.27). - Up to 9 usecs variance in a basic network operation just because of process placement. Same CPU Kernel Test 1 Test 2 Test 3 Test 4 Average 2.6.22 83.03 82.9 82.89 82.92 82.94 2.6.23 83.35 82.81 82.83 82.86 82.96 2.6.24 82.66 82.56 82.64 82.73 82.65 2.6.25 84.28 84.29 84.37 84.3 84.31 2.6.26 84.72 84.38 84.41 84.68 84.55 2.6.27 84.56 84.44 84.41 84.58 84.5 2.6.28 84.7 84.43 84.47 84.48 84.52 2.6.29 84.91 84.67 84.69 84.75 84.76 2.6.30-rc2 84.94 84.72 84.69 84.93 84.82 2.6.30-rc3 84.88 84.7 84.73 84.89 84.8 Same core, different processor (l2 is shared) Kernel Test 1 Test 2 Test 3 Test 4 Average 2.6.22 84.6 84.71 84.52 84.53 84.59 2.6.23 84.59 84.5 84.33 84.34 84.44 2.6.24 84.28 84.3 84.38 84.28 84.31 2.6.25 86.12 85.8 86.2 86.04 86.04 2.6.26 86.61 86.46 86.49 86.7 86.57 2.6.27 87 87.01 87 86.95 86.99 2.6.28 86.53 86.44 86.26 86.24 86.37 2.6.29 85.88 85.94 86.1 85.69 85.9 2.6.30-rc2 86.03 85.93 85.99 86.06 86 2.6.30-rc3 85.73 85.88 85.67 85.94 85.81 Same Socket, different core (l2 not shared) Kernel Test 1 Test 2 Test 3 Test 4 Average 2.6.22 90.08 89.72 90 89.9 89.93 2.6.23 89.72 90.1 89.99 89.86 89.92 2.6.24 89.18 89.28 89.25 89.22 89.23 2.6.25 90.83 90.78 90.87 90.61 90.77 2.6.26 90.51 91.25 91.8 91.69 91.31 2.6.27 91.98 91.93 91.97 91.91 91.95 2.6.28 91.72 91.7 91.84 91.75 91.75 2.6.29 89.85 89.85 90.14 89.9 89.94 2.6.30-rc2 90.78 90.8 90.87 90.73 90.8 2.6.30-rc3 90.84 90.94 91.05 90.84 90.92 Different Socket Kernel Test 1 Test 2 Test 3 Test 4 Average 2.6.22 91.64 91.65 91.61 91.68 91.645 2.6.23 91.9 91.84 91.92 91.83 91.873 2.6.24 91.33 91.24 91.42 91.38 91.343 2.6.25 92.39 92.04 92.3 92.23 92.240 2.6.26 90.64 90.57 90.6 90.08 90.473 2.6.27 91.14 91.26 90.9 91.09 91.098 2.6.28 92.3 91.92 92.3 92.23 92.188 2.6.29 90.57 89.83 89.9 90.41 90.178 2.6.30-rc2 90.59 90.97 90.27 91.69 90.880 2.6.30-rc3 92.08 91.32 91.21 92.06 91.668 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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