linux-kernel - Re: [ANNOUNCE] v5.10-rc2-rt4

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Date:   Wed, 11 Nov 2020 19:39:01 +0100
From:   Daniel Wagner <wagi@...om.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.10-rc2-rt4

Sorry for the late response, I had to reinstall my system after a FS
corruption...

On Mon, Nov 09, 2020 at 05:31:43PM +0100, Sebastian Andrzej Siewior wrote:
> > These test run only very short with hackbench as worlkload (5 minutes).
> > Though I running these tests now for more than year with v4.4-rt and
> > some times the newer -rt releases and I've never seen the latency
> > numbers above 200us unless something was broken. Given that 5 minutes is
> > not really long, I'll let those test run for longer to see if I get the
> > same results when they run for one hour.

- 5.9.0-rc8-rt12, ca 5h
  T: 0 (11626) P:80 C:15092432 Min:     17 Act:   34 Avg:   43 Max:     226

- 5.9.0-rc8-rt13, ca 1.5h
  T: 0 (24661) P:80 C:5581936 Min:     21 Act:   35 Avg:   45 Max:     250

- 5.9.0-rc8-rt14, ca 1h
  T: 0 (  942) P:80 C:6522320 Min:     20 Act:   27 Avg:   44 Max:     352

This matches with the 5 minutes runs. -rt13 was still okay and -rt14
is clearly worse.

> > 5.10.0-rc2-rt4 vs 5.10.0-rc2-rt4(lazy preemption disabled)
> >
> >   0_cyclicdeadline     t2-max-latency       pass/pass                274.00/     61.00     349.18%
>
> So the value went from 274us to 61us after disabling lazy-preempt?

Yes, that was all I changed. I want to redo this measurement. It
really looks a bit bogus. Though, one thing after the other :)

Daniel