From: Jonathan Schwender <schwenderjonathan@gmail.com>
To: Angelo Dureghello <angelo@kernel-space.org>,
linux-rt-users@vger.kernel.org
Subject: Re: big rt latencies compared to non rt
Date: Tue, 11 May 2021 21:50:17 +0200 [thread overview]
Message-ID: <80987725-41e4-017c-5e20-dbd886726ee9@gmail.com> (raw)
In-Reply-To: <736a53fb-d80e-3faa-1a66-d40538e0fe26@kernel-space.org>
Hi Angelo,
>
> Average is near 16uS but there are some outside
> values near 40000, as
You are reading the table wrong. The leftmost column is the microsecond
bucket. The other columns give the amount of times a latency was inside
that microsecond bucket for each measurement thread.
> 000017 040537 015000 033773 041092 <-----
For example, in this line CPU 0 had 40537 latencies in the 17 us bucket,
while CPU 1 had 15000 measured latencies of 17 us (and so forth).
You should also check the line at the End `# Max Latencies: xxxxx`,
which will give you the maximum latency, and the line below which shows
you how often the histogram overflowed.
> Thanks a lot,
>
> Regards,
> angelo
>
Hope I could help,
Jonathan
next prev parent reply other threads:[~2021-05-11 19:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 16:00 big rt latencies compared to non rt Angelo Dureghello
2021-05-11 19:50 ` Jonathan Schwender [this message]
2021-05-11 20:14 ` John Ogness
2021-05-11 20:19 ` Angelo Dureghello
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