Messages in this thread | | | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. | From | Mike Galbraith <> | Date | Sat, 11 Oct 2008 20:13:50 +0200 |
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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
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