linux-kernel - Re: 2463a604a8: netperf.Throughput

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Message-ID: <f572997b-8979-26bb-cb3b-9926086c4cc7@acm.org>
Date:   Tue, 25 May 2021 09:44:26 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, John Garry <john.garry@...wei.com>,
        Hannes Reinecke <hare@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        ying.huang@...el.com, feng.tang@...el.com, zhengjun.xing@...el.com,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Christoph Hellwig <hch@....de>, linux-scsi@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>
Subject: Re: 2463a604a8: netperf.Throughput_tps 12.8% improvement

On 5/24/21 11:44 PM, kernel test robot wrote:
> FYI, we noticed a 12.8% improvement of netperf.Throughput_tps due to commit:
> 
> commit: 2463a604a86728777ce4284214a52de46a808c9e ("[PATCH v3 2/3] Introduce enums for the SAM, message, host and driver status codes")
> url: https://github.com/0day-ci/linux/commits/Bart-Van-Assche/Introduce-enums-for-SCSI-status-codes/20210524-105751
> base: https://git.kernel.org/cgit/linux/kernel/git/mkp/scsi.git for-next
> 
> 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/

The above email reports a performance improvement for the networking
subsystem while my patch only affects the SCSI subsystem and should not
have any performance impact. I'm confused by the above feedback ...

Bart.