linux-kernel - Re: [bpf] b89fbfbb85: netperf.Throughput

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Date:   Thu, 19 Aug 2021 23:29:27 -0700
From:   Yonghong Song <yhs@...com>
To:     kernel test robot <oliver.sang@...el.com>,
        Andrii Nakryiko <andrii@...nel.org>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        <lkp@...ts.01.org>, <lkp@...el.com>, <ying.huang@...el.com>,
        <feng.tang@...el.com>, <zhengjun.xing@...ux.intel.com>
Subject: Re: [bpf] b89fbfbb85: netperf.Throughput_tps -21.3% regression



On 8/19/21 10:50 PM, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed a -21.3% regression of netperf.Throughput_tps due to commit:
> 
> 
> commit: b89fbfbb854c9afc3047e8273cc3a694650b802e ("bpf: Implement minimal BPF perf link")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

Could you do a test again to double check?
The above patch is related to bpf perf_event area.
It should not have any impact with netperf.

> 
> 
> in testcase: netperf
> on test machine: 192 threads 4 sockets 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: 0x5003006
> 
> test-description: Netperf is a benchmark that can be use to measure various aspect of networking performance.
> test-url: http://www.netperf.org/netperf/
> 
> 
> 
[...]