From: Angelo Dureghello <angelo@kernel-space.org>
To: linux-rt-users@vger.kernel.org
Subject: big rt latencies compared to non rt
Date: Tue, 11 May 2021 18:00:01 +0200 [thread overview]
Message-ID: <736a53fb-d80e-3faa-1a66-d40538e0fe26@kernel-space.org> (raw)
Hi all,
i am running some RT tests on imx8qxp.
Kernel is a imx (nxp) modified kernel, but with
rt patch (5.4.70) that at least applies properly.
Linux version 5.4.70-rt40-00120-g3e7dde1168e5-dirty
I am running some histograms by
cyclictest --duration=180 -t=1 -m -Sp99 \
-i2000 -h3000 -q > histogram
Average is near 16uS but there are some outside
values near 40000, as
000009 000000 000000 000000 000000
000010 000001 000000 000002 000000
000011 000002 000000 000000 000000
000012 000023 000006 000008 000004
000013 001565 001504 002010 001367
000014 000425 001959 000649 000700
000015 001447 001917 001129 001415
000016 034084 026118 040328 032334
000017 040537 015000 033773 041092 <-----
000018 005771 009092 007999 007512
000019 002709 023378 001790 003117
000020 000167 006238 000109 000136
000021 000135 002369 000099 000093
000022 000039 000622 000025 000041
000023 000153 000123 000026 000023
000024 000986 000178 000564 000500
000025 001872 000292 001291 001515
000026 000049 000269 000112 000081
000027 000010 000561 000011 000014
000028 000003 000296 000016 000009
000029 000005 000035 000014 000002
000030 000001 000008 000006 000000
000031 000001 000008 000006 000001
000032 000011 000002 000004 000000
Rest of the histogram is mostly 00000 values.
As far as you may know, is there something i am
missing for this cpu ?
Thanks a lot,
Regards,
angelo
next reply other threads:[~2021-05-11 16:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 16:00 Angelo Dureghello [this message]
2021-05-11 19:50 ` big rt latencies compared to non rt Jonathan Schwender
2021-05-11 20:14 ` John Ogness
2021-05-11 20:19 ` Angelo Dureghello
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