linux-kernel - Re: [REGRESSION] 5-10% increase in IO latencies with nohz balance patch

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Date:   Mon, 29 Nov 2021 14:49:28 -0500
From:   Josef Bacik <josef@...icpanda.com>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     peterz@...radead.org, vincent.guittot@...aro.org,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [REGRESSION] 5-10% increase in IO latencies with nohz balance
 patch

On Mon, Nov 29, 2021 at 06:31:17PM +0000, Valentin Schneider wrote:
> On 29/11/21 13:15, Josef Bacik wrote:
> > On Mon, Nov 29, 2021 at 06:03:24PM +0000, Valentin Schneider wrote:
> >> Would you happen to have execution traces by any chance? If not I should be
> >> able to get one out of that fsperf thingie.
> >>
> >
> > I don't, if you want to tell me how I can do it right now.  I've disabled
> > everything on this box for now so it's literally just sitting there waiting to
> > have things done to it.  Thanks,
> >
> 
> I see you have Ftrace enabled in your config, so that ought to do it:
> 
>   trace-cmd record -e 'sched:*' -e 'cpu_idle' $your_test_cmd
> 

http://toxicpanda.com/performance/trace.dat

it's like 16mib.  Enjoy,

Josef