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Bug#645869: marked as done (linux-2.6: keep kernel.sched_autogroup_enabled setting default (to 1))

Your message dated Wed, 19 Oct 2011 15:05:01 +0200
with message-id <1319029501.30618.6.camel@scapa>
and subject line Re: Bug#645869: linux-2.6: keep kernel.sched_autogroup_enabled setting default (to 1)
has caused the Debian Bug report #645869,
regarding linux-2.6: keep kernel.sched_autogroup_enabled setting default (to 1)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
645869: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645869
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--- Begin Message --- 
Package: linux-2.6
Version: 3.0.0-6
Severity: wishlist

Hey,

since few versions, linux-2.6 uses an “autogroup" scheduling setting, which
is supposed to improve the responsiveness, especially for desktop session.

Upstream enables it by default, and there's a sysctl
(kernel.sched_autogroup_enabled) to disable it in case it causes issues.

Debian ships a patch (debian/patches/debian/sched-autogroup-disabled.patch)
which changes the default to disabled.

I'm not too sure what is the rationale for changing the default, but I think
it'd be nice to revert that and keep upstream default, unless there are good
reasons to divert from them.

Regards,
-- 
Yves-Alexis

-- System Information:
Debian Release: wheezy/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.0.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

--- End Message ---
--- Begin Message --- 
On mer., 2011-10-19 at 13:55 +0100, Ben Hutchings wrote:
> On Wed, 2011-10-19 at 10:10 +0200, Yves-Alexis Perez wrote:
> > Package: linux-2.6
> > Version: 3.0.0-6
> 
> Not yet released, so you can't tell whether this will be changed!

Damn, sorry for that, that's the drawback of running bleeding edge :/
> 
> > Severity: wishlist
> > 
> > Hey,
> > 
> > since few versions, linux-2.6 uses an “autogroup" scheduling setting, which
> > is supposed to improve the responsiveness, especially for desktop session.
> > 
> > Upstream enables it by default, and there's a sysctl
> > (kernel.sched_autogroup_enabled) to disable it in case it causes issues.
> > 
> > Debian ships a patch (debian/patches/debian/sched-autogroup-disabled.patch)
> > which changes the default to disabled.
> > 
> > I'm not too sure what is the rationale for changing the default, but I think
> > it'd be nice to revert that and keep upstream default, unless there are good
> > reasons to divert from them.
> 
> The upstream default is that it is disabled at compile-time, since
> SCHED_AUTOGROUP is not 'default y' or selected by any other option.
> 
> Our default matches this but adds the option to enable it at run-time.

Good point, I can understand the rationale (and indeed thought the
config was 'default y').

As the main point was to not divert from upstream, I'm closing the bug.
It might be nice to have it enabled by default, but that's a different
bug, and I guess we can wait for upstream for now.

Thanks for your time.

Regards,
-- 
Yves-Alexis

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