From: Andrew Morton <akpm@osdl.org>
To: arjanv@redhat.com
Cc: davidm@hpl.hp.com, davidm@napali.hpl.hp.com, davej@redhat.com,
mpm@selenic.com, linux-kernel@vger.kernel.org
Subject: Re: Fw: potential /dev/urandom scalability improvement
Date: Fri, 26 Mar 2004 13:17:36 -0800 [thread overview]
Message-ID: <20040326131736.1cc6a939.akpm@osdl.org> (raw)
In-Reply-To: <1080333938.7033.0.camel@laptop.fenrus.com>
Arjan van de Ven <arjanv@redhat.com> wrote:
>
> > a) execute a prefetch at addresses which are not PREFETCH_STRIDE-aligned
> > and, as a consequence,
> >
> > b) prefetch data from the next page, outside the range of the user's
> > (addr,len).
>
> well if you assume that cachelines (and prefetch stride) are proper
> divisors of PAGE_SIZE is that still true ?
Probably not ;)
If someone does
prefetch_range(4096, 1);
on 4k pagesize, what should we do?
Issuing a single
prefetch 4090
sounds reasonable.
In that case I'm arranging for it to perform
prefetch (4096 - 32)
in that case, which seems neater.
next prev parent reply other threads:[~2004-03-26 21:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040325141923.7080c6f0.akpm@osdl.org>
2004-03-25 22:47 ` Matt Mackall
2004-03-26 1:45 ` David Mosberger
2004-03-26 2:00 ` Andrew Morton
2004-03-26 2:10 ` David Mosberger
2004-03-26 4:07 ` Matt Mackall
2004-03-26 4:19 ` Matt Mackall
2004-03-26 4:51 ` David Mosberger
2004-03-26 5:15 ` Matt Mackall
2004-03-26 5:24 ` David Mosberger
2004-03-26 11:06 ` Dave Jones
2004-03-26 18:08 ` David Mosberger
2004-03-26 18:23 ` Dave Jones
2004-03-26 21:31 ` David Mosberger
2004-03-26 18:49 ` Andrew Morton
2004-03-26 20:25 ` David Mosberger
2004-03-26 20:33 ` Andrew Morton
2004-03-26 20:45 ` Arjan van de Ven
2004-03-26 21:17 ` Andrew Morton [this message]
2004-03-27 7:44 ` Arjan van de Ven
2004-03-26 21:12 ` David Mosberger
[not found] <1DLZM-8aK-67@gated-at.bofh.it>
[not found] ` <1DLZM-8aK-65@gated-at.bofh.it>
[not found] ` <1DOE1-20o-17@gated-at.bofh.it>
[not found] ` <1DOXn-2k7-5@gated-at.bofh.it>
[not found] ` <1DXxI-Z7-39@gated-at.bofh.it>
[not found] ` <1E467-6KK-17@gated-at.bofh.it>
[not found] ` <1E4IT-7f3-21@gated-at.bofh.it>
2004-03-27 1:29 ` Andi Kleen
2004-03-27 15:48 ` Matt Mackall
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