linux-kernel - Re: Performance regression: thread wakeup time (latency) increased up to 3x

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Message-ID: <5fe0ffa5-f2db-ca79-5a10-305310066ff9@gmail.com>
Date:   Fri, 15 Oct 2021 02:36:03 -0700
From:   Norbert <nbrtt01@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Performance regression: thread wakeup time (latency) increased up
 to 3x

On 10/15/21 01:52, Peter Zijlstra wrote:
> On Fri, Oct 15, 2021 at 12:43:45AM -0700, Norbert wrote:
>> Performance regression: thread wakeup time (latency) increased up to 3x.
>>
>> Happened between 5.13.8 and 5.14.0. Still happening at least on 5.14.11.
> 
> Could you git-bisect this?
> 

So far I haven't built a kernel yet, I'm quite new to Linux in that way, 
so it may take me some time to figure it all out, but yes.

(By the way, of course I meant that throughput *de*creases, not increases.)