From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Christoph Lameter <clameter@sgi.com>,
Petr Tesarik <ptesarik@suse.cz>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable
Date: Mon, 07 Jul 2008 08:56:13 -0700 [thread overview]
Message-ID: <48723C9D.8090504@goop.org> (raw)
In-Reply-To: <200807072152.59823.nickpiggin@yahoo.com.au>
Nick Piggin wrote:
> Although, you wouldn't need to oversubscribe physical CPUs to hit
> suboptimal behaviour.
>
> Basically, I just ask for performance improvement to be measured
> with some "realistic" configuration, then it should be easier to
> justify.
Overcommitting cpus system-wide is pretty common. A use-case is
consolidating a pile of underused non-performance-critical servers into
one physical machine with a lot of VMs. It doesn't take much load to
cause a dhcp request to the dhcp server to steal a cpu away from the
mysql server while it holds a lock...
I'll mail out my patches so we can have a more concrete discussion shortly.
J
next prev parent reply other threads:[~2008-07-07 15:56 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-06 19:26 Spinlocks waiting with interrupts disabled / preempt disabled Christoph Lameter
2008-05-07 7:30 ` Ingo Molnar
2008-05-07 17:04 ` Christoph Lameter
2008-05-07 17:24 ` Christoph Lameter
2008-05-07 18:49 ` Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable Christoph Lameter
2008-05-09 10:26 ` Ingo Molnar
2008-05-09 16:28 ` Christoph Lameter
2008-06-23 17:19 ` Petr Tesarik
2008-06-23 17:54 ` Peter Zijlstra
2008-06-23 18:20 ` Christoph Lameter
2008-06-23 20:39 ` Peter Zijlstra
2008-06-23 20:45 ` Christoph Lameter
2008-06-23 20:58 ` Peter Zijlstra
2008-06-26 2:51 ` Jeremy Fitzhardinge
2008-06-26 6:51 ` Peter Zijlstra
2008-06-26 15:49 ` Jeremy Fitzhardinge
2008-06-26 9:17 ` Petr Tesarik
2008-06-26 17:02 ` Christoph Lameter
2008-06-26 17:48 ` Peter Zijlstra
2008-07-07 11:50 ` Nick Piggin
2008-07-07 11:52 ` Nick Piggin
2008-07-07 15:56 ` Jeremy Fitzhardinge [this message]
2008-07-08 2:08 ` Nick Piggin
2008-07-07 15:53 ` Jeremy Fitzhardinge
2008-07-07 19:46 ` Rik van Riel
2008-07-07 20:14 ` Jeremy Fitzhardinge
2008-07-08 2:07 ` Nick Piggin
2008-07-08 5:57 ` Jeremy Fitzhardinge
2008-07-08 8:41 ` Nick Piggin
2008-07-08 15:58 ` Jeremy Fitzhardinge
2008-05-09 16:35 ` Spinlocks waiting with interrupts disabled / preempt disabled Olaf Weber
2008-05-09 17:56 ` Peter Zijlstra
2008-05-09 18:00 ` Christoph Lameter
2008-05-09 18:06 ` Peter Zijlstra
2008-05-09 20:01 ` Olaf Weber
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