From: Anton Blanchard <anton@samba.org>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: "Randy.Dunlap" <rddunlap@osdl.org>,
Andrew Morton <akpm@digeo.com>,
linux-kernel@vger.kernel.org, mbligh@aracnet.com
Subject: Re: [PATCH] patch-slab-split-03-tail
Date: Sat, 5 Oct 2002 10:14:34 +1000 [thread overview]
Message-ID: <20021005001434.GA15031@krispykreme> (raw)
In-Reply-To: <3D9E0760.8040507@colorfullife.com>
> <<<<<<<
> An object cache's CPU layer contains per-CPU state that must be
> protected either by per-CPU locking or by disabling interrupts. We
> selected per-CPU locking for several reasons:
> [...]
> x Performance. On most modern processors, grabbing an uncontended
> lock is cheaper than modifying the processor interrupt level.
> <<<<<<<<
>
> Which cpus have slow local_irq_disable() implementations? At least for
> my Duron, this doesn't seem to be the case [~ 4 cpu cycles for cli]
Rusty did some tests and found on the intel chips he tested
local_irq_disable was slower. He posted the results to lkml a few weeks
ago.
On ppc64 it varies between chips.
Anton
prev parent reply other threads:[~2002-10-05 1:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-04 17:04 [PATCH] patch-slab-split-03-tail Manfred Spraul
2002-10-04 19:06 ` Andrew Morton
2002-10-04 19:07 ` Martin J. Bligh
2002-10-04 19:15 ` Andrew Morton
2002-10-04 19:15 ` Manfred Spraul
2002-10-04 20:22 ` Randy.Dunlap
2002-10-04 21:25 ` Manfred Spraul
2002-10-04 21:43 ` Robert Love
2002-10-04 22:30 ` Manfred Spraul
2002-10-05 0:14 ` Anton Blanchard [this message]
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