From: David Mosberger <davidm@napali.hpl.hp.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@transmeta.com>,
davidm@hpl.hp.com, linux-kernel@vger.kernel.org,
davidm@napali.hpl.hp.com
Subject: Re: adjust prefetch in free_one_pgd()
Date: Fri, 2 Aug 2002 09:38:12 -0700 [thread overview]
Message-ID: <15690.46452.806917.37660@napali.hpl.hp.com> (raw)
In-Reply-To: <1028310567.18635.87.camel@irongate.swansea.linux.org.uk>
>>>>> On 02 Aug 2002 18:49:27 +0100, Alan Cox <alan@lxorguk.ukuu.org.uk> said:
Alan> I can't think of anything cachable with nasty side effects we
Alan> might encounter right now but one day someone will do it just
Alan> to be annoying.
Cacheable and side-effects don't go together. Even without explicit
software prefetches, most modern CPUs will happily and aggressively
prefetch stuff from cacheable translations.
That's (partly) why we have this strange situation where execution in
virtual address space is actually _faster_ than in physical space,
even though the former involves more work per memory access.
--david
next prev parent reply other threads:[~2002-08-02 16:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-02 0:12 David Mosberger
2002-08-02 13:04 ` Alan Cox
2002-08-02 15:39 ` David Mosberger
2002-08-02 15:46 ` Linus Torvalds
2002-08-02 15:56 ` Dave Jones
2002-08-02 15:59 ` Linus Torvalds
2002-08-02 16:04 ` Dave Jones
2002-08-02 17:49 ` Alan Cox
2002-08-02 16:38 ` David Mosberger [this message]
2002-08-02 17:58 ` Alan Cox
2002-08-02 16:53 ` David Mosberger
2002-08-03 16:59 ` David Woodhouse
2002-08-03 17:22 ` Linus Torvalds
2002-08-03 17:39 ` David Woodhouse
2002-08-03 19:36 ` Linus Torvalds
2002-08-03 22:03 ` David Woodhouse
2002-08-03 22:40 ` Linus Torvalds
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