From: Andi Kleen <ak@suse.de>
To: Andrew Morton <akpm@zip.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: horrible disk thorughput on itanium
Date: 06 Dec 2001 23:13:40 +0100 [thread overview]
Message-ID: <p73r8q86lpn.fsf@amdsim2.suse.de> (raw)
In-Reply-To: <20011206110713.A8404@cox.rr.com.suse.lists.linux.kernel> <3C0FD955.4510B738@zip.com.au.suse.lists.linux.kernel>
In-Reply-To: Andrew Morton's message of "6 Dec 2001 22:03:56 +0100"
Andrew Morton <akpm@zip.com.au> writes:
>
> The fact that you get the same throughput on each platform with
> the block I/O part of the test indicates that the hardware and
> kernel are OK, but the C library is broken.
The usual difference is if you have a pthreads capable C library
or not. For newer glibc bonnie++ should definitely use
putc_unlocked(); otherwise it'll eat lock overhead for each character
to take the FILE lock.
As far as I can see bonnie++ doesn't use putc_unlocked, but putc.
With libc5 it likely would magically get a lot faster @)
-Andi
next parent reply other threads:[~2001-12-06 22:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20011206110713.A8404@cox.rr.com.suse.lists.linux.kernel>
[not found] ` <3C0FD955.4510B738@zip.com.au.suse.lists.linux.kernel>
2001-12-06 22:13 ` Andi Kleen [this message]
2001-12-07 6:11 ` horrible disk thorughput on itanium Mike Galbraith
2001-12-07 6:15 ` Linus Torvalds
2001-12-07 12:32 ` Greg Hennessy
2001-12-07 17:57 ` Marco Colombo
[not found] <p73r8q86lpn.fsf@amdsim2.suse.de.suse.lists.linux.kernel>
[not found] ` <Pine.LNX.4.33.0112070710120.747-100000@mikeg.weiden.de.suse.lists.linux.kernel>
[not found] ` <9upmqm$7p4$1@penguin.transmeta.com.suse.lists.linux.kernel>
2001-12-07 13:54 ` Andi Kleen
2001-12-07 14:20 ` Padraig Brady
2001-12-07 16:14 ` Richard Gooch
2001-12-07 17:18 ` Robert Love
2001-12-07 17:40 ` Richard Gooch
2001-12-07 17:48 ` Robert Love
2001-12-07 17:45 ` Linus Torvalds
2001-12-07 17:58 ` Andi Kleen
2001-12-07 18:14 ` Michael Poole
2001-12-07 18:35 ` Padraig Brady
2001-12-07 21:22 ` Michael Poole
2001-12-07 21:37 ` Padraig Brady
2001-12-07 22:26 ` Michael Poole
2001-12-07 18:15 ` Linus Torvalds
2001-12-07 18:41 ` Padraig Brady
2001-12-07 18:33 ` Padraig Brady
2001-12-07 20:44 ` Greg Hennessy
2001-12-07 21:37 ` Marco Colombo
2001-12-07 20:42 ` David S. Miller
2001-12-07 6:42 Dan Kegel
-- strict thread matches above, loose matches on Subject: below --
2001-12-06 16:07 Greg Hennessy
2001-12-06 16:17 ` Arjan van de Ven
2001-12-06 20:47 ` Andrew Morton
2001-12-09 23:13 ` Kurt Garloff
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