APPLIED: [PATCH 0/1][SRU][F/master] [Config] lowlatency: turn off

Andrea Righi andrea.righi at canonical.com
Tue Apr 21 06:46:20 UTC 2020


On Fri, Apr 17, 2020 at 01:29:45PM +0200, Paolo Pisati wrote:
> BugLink: https://bugs.launchpad.net/bugs/1873315
> 
> Impact:
> 
> Software that requires RT priority is not working anymore since we turned on
> RT_GROUP_SCHED:
> 
> commit 9b039fc517876d312e7fa0955571101a299c91f5
> Author: Seth Forshee <seth.forshee at canonical.com>
> Date: Mon Apr 6 07:11:44 2020 -0500
> 
> UBUNTU: [Config] CONFIG_RT_GROUP_SCHED=y
> 
> This is wanted by docker, and the original reason for disabling
> it no longer applied. Performance testing shows no noticible
> impact when the option is enabled.
> 
> We already experienced this issue in the past (see
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1284731), but nowadays
> reverting RT_GROUP_SCHED back to off would regress Docker and since RT
> privileges are usually required by audio/multimedia software, it probably makes
> sense to revert this change only for -lowlatency (while keeping the rest as is)
> and encourage people to use -lowlatency if they hit this problem.
> 
> Fix:
> 
> Apply the attached patch
> 
> Regression potential:
> 
> None, only -lowlatency is impacted, -generic doesn't change.
> 
> Paolo Pisati (1):
>   UBUNTU: [Config] lowlatency: turn off RT_GROUP_SCHED
> 
>  debian.master/config/amd64/config.flavour.generic    | 1 +
>  debian.master/config/amd64/config.flavour.lowlatency | 1 +
>  debian.master/config/annotations                     | 5 ++++-
>  debian.master/config/arm64/config.common.arm64       | 1 +
>  debian.master/config/armhf/config.common.armhf       | 1 +
>  debian.master/config/config.common.ubuntu            | 1 -
>  debian.master/config/i386/config.common.i386         | 1 +
>  debian.master/config/ppc64el/config.common.ppc64el   | 1 +
>  debian.master/config/s390x/config.common.s390x       | 1 +
>  9 files changed, 11 insertions(+), 2 deletions(-)
> 
> -- 
> 2.25.1
> 
> 
> -- 
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