From: Ralf Baechle <ralf@linux-mips.org>
To: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] MIPS: Optimize spinlocks.
Date: Wed, 24 Feb 2010 16:54:24 +0100 [thread overview]
Message-ID: <20100224155424.GA24316@linux-mips.org> (raw)
In-Reply-To: <20100224155336.GA5130@linux-mips.org>
On Wed, Feb 24, 2010 at 04:53:36PM +0100, Ralf Baechle wrote:
> And in your benchmarking patch you wrote:
>
> > spin_single spin_multi
> > base 106885 247941
> > spinlock_patch 75194 219465
>
> I did some benchmarking on an IP27 (180MHz, 2 CPU, needs LL/SC workaround):
>
> spin_single spin_multi
> base 229341 3505690
> spinlock_patch 177847 3615326
>
> So about 22% speedup for spin_single but 3% slowdown for spin_multi.
>
> Disabling the R10k LL/SC workaround btw. gives another 23% speedup for
> spin_single and marginal 0.3% for spin_multi; the latter may well be
> statistical noise.
And I forgot the most important - patch queued for 2.6.34.
Thanks!
Ralf
next prev parent reply other threads:[~2010-02-24 15:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-04 19:31 [PATCH] MIPS: Optimize spinlocks David Daney
2010-02-24 15:53 ` Ralf Baechle
2010-02-24 15:54 ` Ralf Baechle [this message]
2010-02-24 16:55 ` David Daney
2010-02-25 14:15 ` Ralf Baechle
2010-02-25 17:31 ` David Daney
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