linux-kernel - Re: [PATCH v3] sched/topology: fix the issue groups don't span domain->span for NUMA diameter

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Date:   Tue, 9 Feb 2021 14:40:05 +0200
From:   Meelis Roos <mroos@...ux.ee>
To:     Barry Song <song.bao.hua@...ilicon.com>,
        valentin.schneider@....com, vincent.guittot@...aro.org,
        mgorman@...e.de, mingo@...nel.org, peterz@...radead.org,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        linux-kernel@...r.kernel.org
Cc:     linuxarm@...neuler.org, xuwei5@...wei.com, liguozhu@...ilicon.com,
        tiantao6@...ilicon.com, wanghuiqiang@...wei.com,
        prime.zeng@...ilicon.com, jonathan.cameron@...wei.com,
        guodong.xu@...aro.org
Subject: Re: [PATCH v3] sched/topology: fix the issue groups don't span
 domain->span for NUMA diameter > 2

I did a rudimentary benchmark on the same 8-node Sun Fire X4600-M2, on top of todays  5.11.0-rc7-00002-ge0756cfc7d7c.

The test: building clean kernel with make -j64 after make clean and drop_caches.

While running clean kernel / 3 tries):

real    2m38.574s
user    46m18.387s
sys     6m8.724s

real    2m37.647s
user    46m34.171s
sys     6m11.993s

real    2m37.832s
user    46m34.910s
sys     6m12.013s


While running patched kernel:

real    2m40.072s
user    46m22.610s
sys     6m6.658s


for real time, seems to be 1.5s-2s slower out of 160s (noise?) User and system time are slightly less, on the other hand, so seems good to me.

-- 
Meelis Roos <mroos@...ux.ee>