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
