Messages in this thread | | | Date | Tue, 12 Jan 2021 15:14:38 +0100 | From | Borislav Petkov <> | Subject | Re: [x86/mce] 7bb39313cd: netperf.Throughput_tps -4.5% regression |
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On Tue, Jan 12, 2021 at 10:21:09PM +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed a -4.5% regression of netperf.Throughput_tps due to commit: > > > commit: 7bb39313cd6239e7eb95198950a02b4ad2a08316 ("x86/mce: Make mce_timed_out() identify holdout CPUs") > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git ras/core > > > in testcase: netperf > on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G memory > with following parameters: > > ip: ipv4 > runtime: 300s > nr_threads: 16 > cluster: cs-localhost > test: TCP_CRR > cpufreq_governor: performance > ucode: 0x5003003 > > test-description: Netperf is a benchmark that can be use to measure various aspect of networking performance. > test-url: http://www.netperf.org/netperf/
I'm very very sceptical this thing benchmarks #MC exception handler performance. Because the code this patch adds gets run only during a MCE exception.
So unless I'm missing something obvious please check your setup.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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