From: David Mosberger <davidm@napali.hpl.hp.com>
To: Andrew Morton <akpm@osdl.org>
Cc: davidm@hpl.hp.com, davidm@napali.hpl.hp.com, mpm@selenic.com,
linux-kernel@vger.kernel.org
Subject: Re: Fw: potential /dev/urandom scalability improvement
Date: Thu, 25 Mar 2004 18:10:39 -0800 [thread overview]
Message-ID: <16483.37151.114594.263358@napali.hpl.hp.com> (raw)
In-Reply-To: <20040325180014.29e40b65.akpm@osdl.org>
>>>>> On Thu, 25 Mar 2004 18:00:14 -0800, Andrew Morton <akpm@osdl.org> said:
Andrew> We may as well stick prefetch_range() in prefetch.h.
Fair enough.
Andrew> And Matt's patch series is not a thing I want to take on
Andrew> board at present, so let's stick with the straight
Andrew> scalability patch for now.
Andrew> I moved the prefetch_range() call to outside the spinlock.
Andrew> Does that make sense?
The other CPUs will dirty that data, so prefetching it before you hold
the lock is almost certainly bad for performance. (Well, to be
precise, it really depends on the number of lines dirtied.)
--david
next prev parent reply other threads:[~2004-03-26 2:10 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 [this message]
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
[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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