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From: David Mosberger <davidm@napali.hpl.hp.com>
To: Andrew Morton <akpm@osdl.org>
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 13:12:33 -0800	[thread overview]
Message-ID: <16484.40129.606865.830739@napali.hpl.hp.com> (raw)
In-Reply-To: <20040326123303.7a775b02.akpm@osdl.org>

>>>>> On Fri, 26 Mar 2004 12:33:03 -0800, Andrew Morton <akpm@osdl.org> said:

  Andrew> If someone does, say,

  Andrew> 	prefetch_range(some_pointer, sizeof(*some_pointer));

  Andrew> then it is possible that prefetch_range() could

  Andrew> a) execute a prefetch at addresses which are not
  Andrew> PREFETCH_STRIDE-aligned and, as a consequence,

  Andrew> b) prefetch data from the next page, outside the range of
  Andrew> the user's (addr,len).

This is getting silly.  Cache-lines _never_ cross page-boundaries.

	--david

  parent reply	other threads:[~2004-03-26 21:12 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
2004-03-27  7:44                     ` Arjan van de Ven
2004-03-26 21:12                 ` David Mosberger [this message]
     [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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