From: Ralf Baechle <ralf@linux-mips.org>
To: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] MIPS: crazy spinlock speed test.
Date: Wed, 24 Feb 2010 16:55:38 +0100 [thread overview]
Message-ID: <20100224155538.GB5130@linux-mips.org> (raw)
In-Reply-To: <1266362795-20199-1-git-send-email-ddaney@caviumnetworks.com>
On Tue, Feb 16, 2010 at 03:26:35PM -0800, David Daney wrote:
> This is just a test program for raw_spinlocks. The main reason I
> wrote it is to validate my spinlock changes that I sent in a previous
> patch.
>
> To use it enable CONFIG_DEBUG_FS and CONFIG_SPINLOCK_TEST then at run
> time do:
>
> # mount -t debugfs none /sys/kernel/debug/
> # cat /sys/kernel/debug/mips/spin_single
> # cat /sys/kernel/debug/mips/spin_multi
>
> On my 600MHz octeon cn5860 (16 CPUs) I get
>
> spin_single spin_multi
> base 106885 247941
> spinlock_patch 75194 219465
>
> This shows that for uncontended locks the spinlock patch gives 41%
> improvement and for contended locks 12% improvement (1/time).
>
> Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Also queued for 2.6.34.
Thanks!
Ralf
prev parent reply other threads:[~2010-02-24 15:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-16 23:26 [PATCH] MIPS: crazy spinlock speed test David Daney
2010-02-24 15:55 ` Ralf Baechle [this message]
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