Re: Compared with debian 10.7, debian 10.8 (with realtime kernel) cyclictest test max latency has increased significantly

To: debian-user@lists.debian.org
Subject: Re: Compared with debian 10.7, debian 10.8 (with realtime kernel) cyclictest test max latency has increased significantly
From: Peter Ehlert <peter@sdi-baja.com>
Date: Sun, 7 Feb 2021 19:28:52 -0800
Message-id: <[🔎] 2da91551-6d87-0a41-5bb9-10ea669d3685@sdi-baja.com>
In-reply-to: <[🔎] 70474267.2503441.1612750950989@mail.yahoo.com>
References: <70474267.2503441.1612750950989.ref@mail.yahoo.com> <[🔎] 70474267.2503441.1612750950989@mail.yahoo.com>

On 2/7/21 6:22 PM, Hongbo Li wrote:

hi！My machine used to run debian 10.7 with realtime kernel (linux-img-rt-amd64)，everything is ok.  A four hours cyclictest test has a result with max latency 8 microseconds. Yesterday I upgraded my machine to debian 10.8,

please read about Debian Point Releases ... https://wiki.debian.org/DebianReleases/PointReleases

and the version of kernel did not change ( 4.19.0-14-rt-amd64), but a new cyclictest test see a significantly increased max latency with 40 microseconds. I don't know why, please help me.

someone else might be able to explain cyclictest testing

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Follow-Ups:
- Re: Compared with debian 10.7, debian 10.8 (with realtime kernel) cyclictest test max latency has increased significantly
  - From: Anders Andersson <pipatron@gmail.com>

References:
- Compared with debian 10.7, debian 10.8 (with realtime kernel) cyclictest test max latency has increased significantly
  - From: Hongbo Li <stevensbsd@yahoo.com>

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