Bug#995997: linux-image-5.14.0-2-amd64: Apps issue lots of clock_gettime calls on 5.14, performance drop in some cases

To: 995997@bugs.debian.org
Subject: Bug#995997: linux-image-5.14.0-2-amd64: Apps issue lots of clock_gettime calls on 5.14, performance drop in some cases
From: Vladimir K <pzs-fs@yandex.ru>
Date: Sat, 09 Oct 2021 23:01:06 +0300
Message-id: <[🔎] 12219981633809666@sas8-75f070ddfcf3.qloud-c.yandex.net>
Reply-to: Vladimir K <pzs-fs@yandex.ru>, 995997@bugs.debian.org
References: <[🔎] 163380095254.1408574.8656548759829450553.reportbug@thinker1>

Forcing clocksource back to tsc with tsc=nowatchdog fixes the performance regression.

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References:
- Bug#995997: linux-image-5.14.0-2-amd64: Apps issue lots of clock_gettime calls on 5.14, performance drop in some cases.
  - From: Vladimir K <pzs-fs@yandex.ru>