From: Christoph Lameter <clameter@sgi.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: A scrub daemon (prezeroing)
Date: Wed, 2 Feb 2005 11:05:14 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.58.0502021103410.12695@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20050202153256.GA19615@logos.cnet>
On Wed, 2 Feb 2005, Marcelo Tosatti wrote:
> Sounds very interesting idea to me. Guess it depends on whether the cost of
> DMA write for memory zeroing, which is memory architecture/DMA engine dependant,
> offsets the cost of CPU zeroing.
>
> Do you have any thoughts on that?
>
> I wonder if such thing (using unrelated devices DMA engine's for zeroing) ever been
> done on other OS'es?
>
> AFAIK SGI's BTE is special purpose hardware for memory zeroing.
Nope the BTE is a block transfer engine. Its an inter numa node DMA thing
that is being abused to zero blocks.
The same can be done with most DMA chips (I have done so on some other
platforms not on i386)
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next prev parent reply other threads:[~2005-02-02 19:05 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
2005-02-02 15:32 ` Marcelo Tosatti
2005-02-02 19:05 ` Christoph Lameter [this message]
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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