From: Andi Kleen <ak@muc.de>
To: michael@optusnet.com.au
Cc: Denis Vlasenko <vda@ilport.com.ua>,
dean gaudet <dean-list-linux-kernel@arctic.org>,
Jeff Garzik <jgarzik@pobox.com>,
Benjamin LaHaise <bcrl@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] x86-64: Use SSE for copy_page and clear_page
Date: Wed, 01 Jun 2005 09:48:17 +0200 [thread overview]
Message-ID: <m1br6qwm9q.fsf@muc.de> (raw)
In-Reply-To: <m2zmuaee2z.fsf@mo.optusnet.com.au> (michael@optusnet.com.au's message of "01 Jun 2005 17:22:28 +1000")
michael@optusnet.com.au writes:
>
> Key point: "using it". This normally involves writes to memory. Most
> applications don't commonly read memory that they haven't previously
> written to. (valgrind et al call that behaviour a "bug" :).
>
> Given that, I'd say you really don't want the page zero routines
> touching the cache.
Writing on a modern CPU requires reading first too to get the rest
of the cache line (provided you don't use write combing or uncached
accesses)
-Andi
next prev parent reply other threads:[~2005-06-01 7:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-30 18:16 [RFC] x86-64: Use SSE for copy_page and clear_page Benjamin LaHaise
2005-05-30 18:45 ` Jeff Garzik
2005-05-30 19:06 ` dean gaudet
2005-05-30 19:11 ` dean gaudet
2005-05-30 19:32 ` Andi Kleen
2005-05-31 8:37 ` Denis Vlasenko
2005-05-31 9:15 ` Denis Vlasenko
2005-05-31 9:23 ` Andi Kleen
2005-05-31 13:59 ` Benjamin LaHaise
2005-06-01 6:22 ` Denis Vlasenko
2005-06-01 6:47 ` Denis Vlasenko
2005-06-01 7:22 ` michael
2005-06-01 7:48 ` Andi Kleen [this message]
2005-06-01 7:48 ` Denis Vlasenko
2005-06-01 21:46 ` dean gaudet
2005-06-01 8:01 ` Nick Piggin
2005-05-30 19:38 ` Andi Kleen
2005-05-30 20:05 ` Michael Thonke
2005-05-30 20:14 ` Benjamin LaHaise
2005-05-30 20:42 ` Michael Thonke
2005-05-31 7:11 ` Andi Kleen
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