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Date: Wed, 14 Feb 2018 22:46:20 +0000
From: Matt Fleming <matt@...eblueprint.co.uk>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Jon Maloy <jon.maloy@...csson.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"mingo@...nel.org" <mingo@...nel.org>,
"David Miller (davem@...emloft.net)" <davem@...emloft.net>,
Mike Galbraith <umgwanakikbuti@...il.com>
Subject: Re: Serious performance degradation in Linux 4.15
On Mon, 12 Feb, at 04:16:42PM, Peter Zijlstra wrote:
> On Fri, Feb 09, 2018 at 05:59:12PM +0000, Jon Maloy wrote:
> > Command for TCP:
> > "netperf TCP_STREAM (netperf -n 4 -f m -c 4 -C 4 -P 1 -H 10.0.0.1 -t TCP_STREAM -l 10 -- -O THROUGHPUT)"
> > Command for TIPC:
> > "netperf TIPC_STREAM (netperf -n 4 -f m -c 4 -C 4 -P 1 -H 10.0.0.1 -t TCP_STREAM -l 10 -- -O THROUGHPUT)"
>
> That looks like identical tests to me. And my netperf (debian testing)
> doesn't appear to have -t TIPC_STREAM.
>
> Please try a coherent report and I'll have another look. Don't (again)
> forget to mention what kind of setup you're running this on.
>
>
> On my IVB-EP (2 sockets, 10 cores, 2 threads), performance cpufreq,
> PTI=n RETPOLINE=n, I get:
Here's some more numbers. This is with RETPOLINE=y but you'll see it
doesn't make much of a difference. Oh, this is also with powersave
cpufreq governor.
The 'tip+' column is tip/master, commit ca96ad6978c3 ("Merge branch 'x86/mm'")
The 'tip-plus-patch+' column is tip/master plus Peter's patch from
20180212151642.GU25201@...ez.programming.kicks-ass.net
netperf-tcp
4.15.0-rc1 4.15.0 4.16.0-rc1 4.16.0-rc1
vanilla vanilla tip+ tip-plus-patch+
Min 64 1804.73 ( 0.00%) 951.28 ( -47.29%) 956.77 ( -46.99%) 936.19 ( -48.13%)
Min 128 3352.00 ( 0.00%) 1847.80 ( -44.87%) 1831.41 ( -45.36%) 1808.88 ( -46.04%)
Min 256 5619.02 ( 0.00%) 3327.27 ( -40.79%) 3287.00 ( -41.50%) 3311.33 ( -41.07%)
Min 1024 17325.58 ( 0.00%) 11053.24 ( -36.20%) 11098.91 ( -35.94%) 10892.59 ( -37.13%)
Min 2048 27564.59 ( 0.00%) 18311.31 ( -33.57%) 18649.89 ( -32.34%) 18327.69 ( -33.51%)
Min 3312 33677.30 ( 0.00%) 25254.43 ( -25.01%) 24897.65 ( -26.07%) 25464.71 ( -24.39%)
Min 4096 35624.64 ( 0.00%) 28186.09 ( -20.88%) 27317.58 ( -23.32%) 27046.46 ( -24.08%)
Min 8192 42950.87 ( 0.00%) 33407.18 ( -22.22%) 34133.19 ( -20.53%) 33429.82 ( -22.17%)
Min 16384 46798.74 ( 0.00%) 40020.99 ( -14.48%) 40761.81 ( -12.90%) 40370.88 ( -13.74%)
Hmean 64 1818.68 ( 0.00%) 959.16 ( -47.26%) 962.40 ( -47.08%) 954.96 ( -47.49%)
Hmean 128 3405.06 ( 0.00%) 1860.21 ( -45.37%) 1844.12 ( -45.84%) 1849.44 ( -45.69%)
Hmean 256 5777.53 ( 0.00%) 3371.67 ( -41.64%) 3341.43 ( -42.17%) 3360.35 ( -41.84%)
Hmean 1024 17679.46 ( 0.00%) 11326.96 ( -35.93%) 11192.24 ( -36.69%) 11219.22 ( -36.54%)
Hmean 2048 27764.04 ( 0.00%) 18864.94 ( -32.05%) 18833.51 ( -32.17%) 18740.31 ( -32.50%)
Hmean 3312 35253.65 ( 0.00%) 25444.33 ( -27.82%) 25700.57 ( -27.10%) 25610.63 ( -27.35%)
Hmean 4096 36479.20 ( 0.00%) 28636.63 ( -21.50%) 28073.90 ( -23.04%) 27856.51 ( -23.64%)
Hmean 8192 43386.27 ( 0.00%) 34771.52 ( -19.86%) 35213.44 ( -18.84%) 34603.90 ( -20.24%)
Hmean 16384 47487.74 ( 0.00%) 41329.50 ( -12.97%) 41096.73 ( -13.46%) 40787.33 ( -14.11%)
Stddev 64 12.42 ( 0.00%) 6.35 ( 48.87%) 5.77 ( 53.54%) 12.21 ( 1.73%)
Stddev 128 45.84 ( 0.00%) 9.25 ( 79.82%) 13.49 ( 70.57%) 23.86 ( 47.95%)
Stddev 256 90.59 ( 0.00%) 30.55 ( 66.28%) 37.07 ( 59.08%) 28.66 ( 68.36%)
Stddev 1024 322.33 ( 0.00%) 164.75 ( 48.89%) 119.05 ( 63.07%) 265.42 ( 17.65%)
Stddev 2048 153.04 ( 0.00%) 424.98 (-177.70%) 176.40 ( -15.26%) 242.90 ( -58.72%)
Stddev 3312 1024.93 ( 0.00%) 182.58 ( 82.19%) 585.07 ( 42.92%) 108.93 ( 89.37%)
Stddev 4096 696.34 ( 0.00%) 433.20 ( 37.79%) 626.42 ( 10.04%) 712.05 ( -2.26%)
Stddev 8192 478.31 ( 0.00%) 808.23 ( -68.98%) 794.39 ( -66.08%) 698.27 ( -45.99%)
Stddev 16384 720.05 ( 0.00%) 816.70 ( -13.42%) 412.26 ( 42.75%) 325.43 ( 54.81%)
CoeffVar 64 0.68 ( 0.00%) 0.66 ( 3.05%) 0.60 ( 12.20%) 1.28 ( -87.13%)
CoeffVar 128 1.35 ( 0.00%) 0.50 ( 63.06%) 0.73 ( 45.66%) 1.29 ( 4.17%)
CoeffVar 256 1.57 ( 0.00%) 0.91 ( 42.21%) 1.11 ( 29.24%) 0.85 ( 45.59%)
CoeffVar 1024 1.82 ( 0.00%) 1.45 ( 20.22%) 1.06 ( 41.65%) 2.36 ( -29.74%)
CoeffVar 2048 0.55 ( 0.00%) 2.25 (-308.53%) 0.94 ( -69.91%) 1.30 (-135.12%)
CoeffVar 3312 2.91 ( 0.00%) 0.72 ( 75.30%) 2.28 ( 21.68%) 0.43 ( 85.36%)
CoeffVar 4096 1.91 ( 0.00%) 1.51 ( 20.74%) 2.23 ( -16.88%) 2.55 ( -33.88%)
CoeffVar 8192 1.10 ( 0.00%) 2.32 (-110.77%) 2.25 (-104.56%) 2.02 ( -82.99%)
CoeffVar 16384 1.52 ( 0.00%) 1.98 ( -30.31%) 1.00 ( 33.83%) 0.80 ( 47.37%)
Max 64 1832.51 ( 0.00%) 966.09 ( -47.28%) 970.35 ( -47.05%) 967.15 ( -47.22%)
Max 128 3476.62 ( 0.00%) 1873.20 ( -46.12%) 1865.28 ( -46.35%) 1869.10 ( -46.24%)
Max 256 5839.83 ( 0.00%) 3402.61 ( -41.73%) 3379.67 ( -42.13%) 3383.69 ( -42.06%)
Max 1024 18031.63 ( 0.00%) 11482.14 ( -36.32%) 11396.22 ( -36.80%) 11463.71 ( -36.42%)
Max 2048 27912.65 ( 0.00%) 19343.06 ( -30.70%) 19095.51 ( -31.59%) 18969.02 ( -32.04%)
Max 3312 36142.68 ( 0.00%) 25749.54 ( -28.76%) 26503.65 ( -26.67%) 25767.14 ( -28.71%)
Max 4096 37481.84 ( 0.00%) 29189.76 ( -22.12%) 28875.41 ( -22.96%) 28973.52 ( -22.70%)
Max 8192 44101.03 ( 0.00%) 35471.04 ( -19.57%) 35890.95 ( -18.62%) 35178.96 ( -20.23%)
Max 16384 48321.50 ( 0.00%) 42086.21 ( -12.90%) 41793.29 ( -13.51%) 41152.43 ( -14.84%)
Peter, if you want to run this test yourself you can do:
1. git clone https://github.com/gorman/mmmtests.git
2. cd mmtests
3. ./run-mmtests.sh --config=configs/config-global-dhp__network-netperf-unbound `uname -r`
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