From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] improve scalability of 2.4.21 fpassist
Date: Tue, 29 Jul 2003 23:06:36 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105952002320917@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105726499515305@msgid-missing>
On Thursday 03 July 2003 2:36 pm, John Hawkes wrote:
> This change has already made its way into linux-2.5.72-ia64-031619.diff.
> Here is the diff relative to 2.4.21 + linux-2.4.21-ia64-030702.diff.
>
> This patch *significantly* improves the scalability of handle_fpu_swa()
> when multiple CPUs are generating concurrent fp-assist traps.
> The original algorithm produces cacheline ping-ponging for the cacheline
> that contains fpu_swa_count. This new algorithm only dirties
> fpu_sw_count when the printk() is about to occur, rather than on every
> fpassist trap, which throttles the ping-ponging to no more than five per
> second.
I applied this for 2.4. Thanks!
Bjorn
prev parent reply other threads:[~2003-07-29 23:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-03 20:36 [PATCH] improve scalability of 2.4.21 fpassist John Hawkes
2003-07-29 23:06 ` Bjorn Helgaas [this message]
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