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

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Date:   Wed, 4 Nov 2020 13:47:46 +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

On Wed, Nov 04, 2020 at 12:19:48PM +0100, Daniel Wagner wrote:
> Yes, Just fired up signaltest 5 times for arm64 and x86_64 with the
> latest release. Keep you posted.

arm64
  1184  0_signaltest         t0-max-latency      : fail     386.00
  1185  0_signaltest         t0-max-latency      : fail     417.00
  1186  0_signaltest         t0-max-latency      : fail     350.00
  1187  0_signaltest         t0-max-latency      : fail     360.00
  1188  0_signaltest         t0-max-latency      : fail     339.00

I noticed that also the last view 5.9-rt releases have higher values.
For example, version 5.9.0-rc8-rt12 has only 217us.

x86_64
  1189  0_signaltest         t0-max-latency      : fail      50.00
  1190  0_signaltest         t0-max-latency      : pass      46.00
  1191  0_signaltest         t0-max-latency      : pass      45.00
  1192  0_signaltest         t0-max-latency      : pass      47.00
  1193  0_signaltest         t0-max-latency      : fail      52.00

Same thing for version 5.9.0-rc8-rt12, the max value was 40us.

I'll work on getting these reports more useful, the performance trend
seems to be an interesting metric.