From: Ralf Baechle <ralf@linux-mips.org>
To: Robin Holt <holt@sgi.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
Christoph Lameter <clameter@sgi.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: A scrub daemon (prezeroing)
Date: Tue, 8 Feb 2005 11:31:32 +0000 [thread overview]
Message-ID: <20050208113131.GA5143@linux-mips.org> (raw)
In-Reply-To: <20050127131228.GB31288@lnx-holt.americas.sgi.com>
On Thu, Jan 27, 2005 at 07:12:29AM -0600, Robin Holt wrote:
> > Some architectures tend to have spare DMA engines lying around. There's
> > no need to use the CPU for zeroing pages. How feasible would it be for
> > scrubd to use these?
>
> An earlier proposal that Christoph pushed would have used the BTE on
> sn2 for this. Are you thinking of using the BTE on sn0/sn1 mips?
On BCM1250 SOCs we've gone a step beyond that and use the Data Mover to
clear_page(), see arch/mips/mm/pg-sb1.c. It's roughly comparable to the
SN0 BTE. Broadcom has meassured a quite large performance win for such
a small code change.
Ralf
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next prev parent reply other threads:[~2005-02-08 11:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-21 20:29 Christoph Lameter
2005-01-27 12:15 ` David Woodhouse
2005-01-27 13:12 ` Robin Holt
2005-01-27 13:14 ` David Woodhouse
2005-01-27 17:02 ` Christoph Lameter
2005-02-08 11:31 ` Ralf Baechle [this message]
2005-02-02 15:32 ` Marcelo Tosatti
2005-02-02 19:05 ` Christoph Lameter
2005-02-02 16:31 ` Marcelo Tosatti
2005-02-02 21:31 ` Christoph Lameter
2005-02-02 21:39 ` David Woodhouse
2005-02-03 3:06 ` Rik van Riel
2005-02-03 23:39 ` Paul Mackerras
2005-02-04 0:59 ` Christoph Lameter
2005-02-04 5:30 ` Paul Mackerras
2005-02-04 6:26 ` Christoph Lameter
2005-02-04 6:43 ` Nick Piggin
2005-02-04 6:50 ` Christoph Lameter
2005-02-04 9:20 ` Paul Mackerras
2005-02-04 9:28 ` Andi Kleen
2005-02-04 17:02 ` Christoph Lameter
2005-02-04 22:25 ` Paul Mackerras
2005-02-02 21:00 ` Maciej W. Rozycki
2005-02-02 21:33 ` David Woodhouse
-- strict thread matches above, loose matches on Subject: below --
2005-01-04 23:13 Prezeroing V3 [1/4]: Allow request for zeroed memory Christoph Lameter
2005-01-08 21:12 ` Hugh Dickins
2005-01-08 21:56 ` David S. Miller
2005-01-21 20:15 ` A scrub daemon (prezeroing) Christoph Lameter
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