linux-kernel - Re: [perf] 06e0dbcfd3: phoronix-test-suite.mbw.0.mib

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Message-ID: <20191027163248.nv63uybzjstoigj5@two.firstfloor.org>
Date:   Sun, 27 Oct 2019 09:32:50 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, andi@...stfloor.org,
        kan.liang@...ux.intel.com, lkp@...ts.01.org
Subject: Re: [perf]  06e0dbcfd3:  phoronix-test-suite.mbw.0.mib_s 12.6%
 improvement

On Sun, Oct 27, 2019 at 01:18:12PM +0800, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed a 12.6% improvement of phoronix-test-suite.mbw.0.mib_s due to commit:

Wow! Sadly it's a false positive, from lowering perf overhead, instead
of improving the workload. Still seems like a good thing.

Note that there is a perf user tool change coming soon that will likely
improve it even more (using affiity to optimize all perf IPIs).

-Andi