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

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Message-ID: <8957c970-88f2-40a8-835f-062ed7a982af@gmail.com>
Date:   Mon, 1 Nov 2021 18:35:05 -0700
From:   Norbert <nbrtt01@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yunfeng Ye <yeyunfeng@...wei.com>, frederic@...nel.org
Subject: Re: Performance regression: thread wakeup time (latency) increased up
 to 3x

On 10/23/21 22:09, Norbert wrote:
> (The more important part being SCHED_FIFO.)

Please ignore this side-comment. The decisive factor is 
isolated/nohz_full vs normal.

There are indications that "normal" times have become worse lately 
(measured in 5.14.14), relative to earlier, but in that area the 
fluctuations I see in my current tests are too large to get a clear picture.

Best, Norbert