From: Arjan van de Ven <arjanv@redhat.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: akpm@osdl.org, "Martin J. Bligh" <mbligh@aracnet.com>,
linux-mm@kvack.org
Subject: Re: [PATCH] shrink per_cpu_pages to fit 32byte cacheline
Date: Tue, 14 Sep 2004 13:13:29 +0200 [thread overview]
Message-ID: <20040914111329.GB21362@devserv.devel.redhat.com> (raw)
In-Reply-To: <20040914093407.GA23935@logos.cnet>
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On Tue, Sep 14, 2004 at 06:34:07AM -0300, Marcelo Tosatti wrote:
> How come short access can cost 1 extra cycle? Because you need two "read bytes" ?
on an x86, a word (2byte) access will cause a prefix byte to the
instruction, that particular prefix byte will take an extra cycle during execution
of the instruction and potentially reduces the parallal decodability of
instructions....
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next prev parent reply other threads:[~2004-09-14 11:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-13 23:38 [PATCH] shrink per_cpu_pages to fit 32byte cacheline Marcelo Tosatti
2004-09-14 6:10 ` Arjan van de Ven
2004-09-14 9:34 ` Marcelo Tosatti
2004-09-14 11:13 ` Arjan van de Ven [this message]
2004-09-14 10:01 ` Marcelo Tosatti
2004-09-14 11:44 ` Arjan van de Ven
2004-09-14 22:45 ` Marcelo Tosatti
2004-09-15 0:57 ` Nick Piggin
2004-09-15 0:48 ` Marcelo Tosatti
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