Re: d4252071b9: fxmark.ssd_ext4_no_jnl_DWTL_54_directio.works/sec -26.5% regression #forregzbot

[Thorsten Leemhuis <regressions@leemhuis.info>]

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.


On 31.08.22 09:21, kernel test robot wrote:
> 
> hi, pleased be noted that we read this patch and understand it as a fix,
> also what we understand is, since the patch itself adds some memory barrier,
> some regression in block IO area is kind of expected.
> 
> after more internal review, we still decided to report out to share our finding
> in our tests, and for your information that how this patch could impact
> performance in some cases. please let us know if you have any concern.
> 
> Thanks a lot!
> 
> below is the full report.
> 
> 
> Greeting,
> 
> FYI, we noticed a -26.5% regression of fxmark.ssd_ext4_no_jnl_DWTL_54_directio.works/sec due to commit:

Due to some bug in regzbot (one I saldy have no time to look into right
now) regzbot didn't see the fix for this, so let's do it manually:

#regzbot fixed-by: 2f79cdfe58c13949bbbb6

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.