From: Paul Jackson <pj@engr.sgi.com>
To: Robert Hancock <hancockr@shaw.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: AMD64 Machine hardlocks when using memset
Date: Fri, 1 Apr 2005 20:11:05 -0800 [thread overview]
Message-ID: <20050401201105.4a03bda1.pj@engr.sgi.com> (raw)
In-Reply-To: <424E0424.7080308@shaw.ca>
Robert wrote:
> It does run visibly slower
The x86_64 memset(), both in user space and the kernel, for whatever gcc
I have, and for a current kernel, uses the "repz stos" or "rep stosq"
prefixed instruction for the bulk of the copy. This combination is a
long running, interruptible Intel string instruction that loops on
itself until the CX register decrements to zero.
Was your windows app using "stos"?
I'll wager a nickel that the actual crash you see comes when the
processor has to handle an interrupt while in the middle of this
instruction.
I'll wager a dime it's hardware, though interrupt activity may be
required to provoke it.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@engr.sgi.com> 1.650.933.1373, 1.925.600.0401
next prev parent reply other threads:[~2005-04-02 4:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3NZDp-4yY-7@gated-at.bofh.it>
[not found] ` <3NZN4-4EZ-1@gated-at.bofh.it>
[not found] ` <3O2rK-6MU-19@gated-at.bofh.it>
[not found] ` <3O34n-7oN-19@gated-at.bofh.it>
[not found] ` <3O4tp-8tL-3@gated-at.bofh.it>
2005-04-01 1:33 ` Robert Hancock
[not found] ` <3OmgF-6HV-17@gated-at.bofh.it>
[not found] ` <3OmgF-6HV-15@gated-at.bofh.it>
[not found] ` <3Oy8m-74-15@gated-at.bofh.it>
2005-04-02 2:32 ` Robert Hancock
2005-04-02 4:11 ` Paul Jackson [this message]
2005-04-02 4:50 ` Robert Hancock
2005-04-04 10:45 ` Alan Cox
2005-04-06 8:47 ` Denis Vlasenko
[not found] <3Ojst-4kX-19@gated-at.bofh.it>
[not found] ` <3OGIo-7oY-13@gated-at.bofh.it>
[not found] ` <3OGIo-7oY-15@gated-at.bofh.it>
[not found] ` <3OGIo-7oY-17@gated-at.bofh.it>
[not found] ` <3OGIo-7oY-11@gated-at.bofh.it>
[not found] ` <3OIh7-cc-1@gated-at.bofh.it>
[not found] ` <3OITV-AR-3@gated-at.bofh.it>
[not found] ` <3PxjH-812-3@gated-at.bofh.it>
2005-04-06 4:05 ` Robert Hancock
2005-04-06 7:02 ` Rafael J. Wysocki
2005-04-06 9:31 ` Philip Lawatsch
2005-04-06 10:59 ` Philip Lawatsch
2005-04-06 11:15 ` Arjan van de Ven
2005-04-06 11:22 ` Philip Lawatsch
[not found] <3NTHD-8ih-1@gated-at.bofh.it>
[not found] ` <3NVqb-1iK-33@gated-at.bofh.it>
2005-03-31 4:32 ` Robert Hancock
2005-03-31 4:38 ` Robert Hancock
2005-03-31 7:25 ` Denis Vlasenko
2005-03-31 8:15 ` Paul Jackson
2005-03-31 9:37 ` Philip Lawatsch
2005-03-31 10:15 ` Paul Jackson
2005-03-31 7:41 ` Paul Jackson
2005-03-31 11:40 ` Mikael Pettersson
2005-03-31 18:47 ` Paul Jackson
[not found] ` <3O99L-40N-9@gated-at.bofh.it>
2005-04-01 4:37 ` Robert Hancock
2005-04-01 10:41 ` Denis Vlasenko
2005-04-01 17:27 ` Ray Lee
2005-04-01 19:14 ` Philip Lawatsch
2005-03-30 22:04 Philip Lawatsch
2005-03-31 0:05 ` Matthias-Christian Ott
2005-03-31 14:45 ` Stelian Pop
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