Messages in this thread | | | Date | Mon, 2 Nov 2020 11:00:08 +0000 | From | Mel Gorman <> | Subject | Re: [sched/fair] d8fcb81f1a: netperf.Throughput_tps -16.9% regression |
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On Sun, Nov 01, 2020 at 04:24:52PM +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed a -16.9% regression of netperf.Throughput_tps due to commit: > > > commit: d8fcb81f1acf651a0e50eacecca43d0524984f87 ("sched/fair: Check for idle core in wake_affine") > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core > > > in testcase: netperf > on test machine: 144 threads Intel(R) Xeon(R) Gold 5318H CPU @ 2.50GHz with 128G memory > with following parameters: > > ip: ipv4 > runtime: 300s > nr_threads: 25% > cluster: cs-localhost > test: SCTP_RR > cpufreq_governor: performance > ucode: 0x700001c > > test-description: Netperf is a benchmark that can be use to measure various aspect of networking performance. > test-url: http://www.netperf.org/netperf/ > > In addition to that, the commit also has significant impact on the following tests: > > +------------------+------------------------------------------------------------------------+ > | testcase: change | aim7: aim7.jobs-per-min 8.7% improvement | > | test machine | 144 threads Intel(R) Xeon(R) Gold 5318H CPU @ 2.50GHz with 128G memory | > | test parameters | cpufreq_governor=performance | > | | disk=1BRD_48G | > | | fs=xfs | > | | load=600 | > | | test=sync_disk_rw | > | | ucode=0x700001c | > +------------------+------------------------------------------------------------------------+ > > If you fix the issue, kindly add following tag > Reported-by: kernel test robot <rong.a.chen@intel.com> >
I know I ran tests against this patch in general and gave an Ack but these cases were not covered by me. For netperf, I neither vary the number of threads nor did I cover SCTP_RR so this could be an example of where the patch is a loss. I also had run reaim but not specifically for one sub-test like this does and the generation of machines used was much older than Gold 5318H. Grid or no grid, complete coverage is a challenge
-- Mel Gorman SUSE Labs
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