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

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

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

Seems to be related: 5.14 chooses hpet clocksource, while 5.10 uses tsc: kernel: Linux version 5.10.0-8-amd64 (debian-ker...@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.10.46-4 (2021-08-03) kernel: tsc: Fast TSC

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

Package: src:linux Version: 5.14.9-2 Severity: normal Dear Maintainer, after upgrade from 5.10 to 5.14 I noticed severe pefrormance regression when running GZDoom with content above some threshold of complexity. More info here: https://github.com/coelckers/gzdoom/issues/1479 It seems to be