From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] sched: prefer wakers
Date: Tue, 16 Dec 2008 10:05:43 +0100 [thread overview]
Message-ID: <1229418343.7438.10.camel@marge.simson.net> (raw)
In-Reply-To: <20081216074636.176935879@chello.nl>
On Tue, 2008-12-16 at 08:45 +0100, Peter Zijlstra wrote:
> plain text document attachment (wakeup-preempt-fiddle.patch)
> Prefer tasks that wake other tasks to preempt quickly. This improves
> performance because more work is available sooner.
>
> The workload that prompted this patch was a kernel build over NFS4 (for some
> curious and not understood reason we had to revert commit:
> 18de9735300756e3ca9c361ef58409d8561dfe0d to make any progress at all)
>
> Without this patch a make -j8 bzImage (of x86-64 defconfig) would take
> 3m30-ish, with this patch we're down to 2m50-ish.
Here, with wimpy 100Mbps nic and my normal config, the improvement is
considerably larger. Full make -j8 build went from ~6m17s to ~4m28s.
-Mike
prev parent reply other threads:[~2008-12-16 9:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-16 7:45 [PATCH 0/3] scheduler patches Peter Zijlstra
2008-12-16 7:45 ` [PATCH 1/3] From: Mike Galbraith <efault@gmx.de> Peter Zijlstra
2008-12-16 7:54 ` Peter Zijlstra
2008-12-16 7:45 ` [PATCH 2/3] sched: optimize update_curr() Peter Zijlstra
2008-12-16 7:45 ` [PATCH 3/3] sched: prefer wakers Peter Zijlstra
2008-12-16 9:05 ` Mike Galbraith [this message]
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