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Message-Id: <1223748830.4598.16.camel@marge.simson.net> Date: Sat, 11 Oct 2008 20:13:50 +0200 From: Mike Galbraith <efault@....de> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Evgeniy Polyakov <s0mbre@...rvice.net.ru>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net> Subject: Re: [tbench regression fixes]: digging out smelly deadmen. On Sat, 2008-10-11 at 16:39 +0200, Peter Zijlstra wrote: > That said, we can probably still avoid the division for the top level > stuff, because the sum of the top level weights is still invariant > between all tasks. Less math would be nice of course... > I'll have a stab at doing so... I initially didn't do this because my > first try gave some real ugly code, but we'll see - these numbers are a > very convincing reason to try again. ...but the numbers I get on Q6600 don't pin the tail on the math donkey. Update to UP test log. 2.6.27-final-up ring-test - 1.193 us/cycle = 838 KHz (gcc-4.3) tbench - 337.377 MB/sec tso/gso on tbench - 340.362 MB/sec tso/gso off netperf - 120751.30 rr/s tso/gso on netperf - 121293.48 rr/s tso/gso off 2.6.27-final-up patches/revert_weight_and_asym_stuff.diff ring-test - 1.133 us/cycle = 882 KHz (gcc-4.3) tbench - 340.481 MB/sec tso/gso on tbench - 343.472 MB/sec tso/gso off netperf - 119486.14 rr/s tso/gso on netperf - 121035.56 rr/s tso/gso off 2.6.28-up ring-test - 1.149 us/cycle = 870 KHz (gcc-4.3) tbench - 343.681 MB/sec tso/gso off netperf - 122812.54 rr/s tso/gso off My SMP log, updated to account for TSO/GSO monkey-wrench. (<bleep> truckload of time <bleep> wasted chasing unbisectable <bleepity-bleep> tso gizmo. <bleep!>) SMP config, same as UP kernels tested, except SMP. tbench -t 60 4 localhost followed by four 60 sec netperf TCP_RR pairs, each pair on it's own core of my Q6600. 2.6.22.19 Throughput 1250.73 MB/sec 4 procs 1.00 16384 87380 1 1 60.01 111272.55 1.00 16384 87380 1 1 60.00 104689.58 16384 87380 1 1 60.00 110733.05 16384 87380 1 1 60.00 110748.88 2.6.22.19-cfs-v24.1 Throughput 1213.21 MB/sec 4 procs .970 16384 87380 1 1 60.01 108569.27 .992 16384 87380 1 1 60.01 108541.04 16384 87380 1 1 60.00 108579.63 16384 87380 1 1 60.01 108519.09 2.6.23.17 Throughput 1200.46 MB/sec 4 procs .959 16384 87380 1 1 60.01 95987.66 .866 16384 87380 1 1 60.01 92819.98 16384 87380 1 1 60.01 95454.00 16384 87380 1 1 60.01 94834.84 2.6.23.17-cfs-v24.1 Throughput 1238.68 MB/sec 4 procs .990 16384 87380 1 1 60.01 105871.52 .969 16384 87380 1 1 60.01 105813.11 16384 87380 1 1 60.01 106106.31 16384 87380 1 1 60.01 106310.20 2.6.24.7 Throughput 1204 MB/sec 4 procs .962 16384 87380 1 1 60.00 99599.27 .910 16384 87380 1 1 60.00 99439.95 16384 87380 1 1 60.00 99556.38 16384 87380 1 1 60.00 99500.45 2.6.25.17 Throughput 1223.16 MB/sec 4 procs .977 16384 87380 1 1 60.00 101768.95 .930 16384 87380 1 1 60.00 101888.46 16384 87380 1 1 60.01 101608.21 16384 87380 1 1 60.01 101833.05 2.6.26.5 Throughput 1183.47 MB/sec 4 procs .945 16384 87380 1 1 60.00 100837.12 .922 16384 87380 1 1 60.00 101230.12 16384 87380 1 1 60.00 100868.45 16384 87380 1 1 60.00 100491.41 numbers above here are gcc-4.1, below gcc-4.3 2.6.26.6 Throughput 1177.18 MB/sec 4 procs 16384 87380 1 1 60.00 100896.10 16384 87380 1 1 60.00 100028.16 16384 87380 1 1 60.00 101729.44 16384 87380 1 1 60.01 100341.26 TSO/GSO off 2.6.27-final Throughput 1177.39 MB/sec 4 procs 16384 87380 1 1 60.00 98830.65 16384 87380 1 1 60.00 98722.47 16384 87380 1 1 60.00 98565.17 16384 87380 1 1 60.00 98633.03 2.6.27-final patches/revert_weight_and_asym_stuff.diff Throughput 1167.67 MB/sec 4 procs 16384 87380 1 1 60.00 97003.05 16384 87380 1 1 60.00 96758.42 16384 87380 1 1 60.00 96432.01 16384 87380 1 1 60.00 97060.98 2.6.28.git Throughput 1173.14 MB/sec 4 procs 16384 87380 1 1 60.00 98449.33 16384 87380 1 1 60.00 98484.92 16384 87380 1 1 60.00 98657.98 16384 87380 1 1 60.00 98467.39 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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