Date: Sat, 3 Jan 2004 21:56:42 +0100
From: Tobias Diedrich <ranma@gmx.at>
To: linux-kernel@vger.kernel.org
Subject: Re: Strange IDE performance change in 2.6.1-rc1 (again)
Message-ID: <20040103205642.GA517@melchior.yamamaya.is-a-geek.org>
Mail-Followup-To: Tobias Diedrich <ranma@gmx.at>,
	linux-kernel@vger.kernel.org
References: <200401021658.41384.ornati@lycos.it> <3FF5B3AB.5020309@wmich.edu> <200401022200.22917.ornati@lycos.it> <20040103033327.GA413@melchior.yamamaya.is-a-geek.org> <200401030415.i034FJoc006230@turing-police.cc.vt.edu> <20040103133945.GB396@melchior.yamamaya.is-a-geek.org>
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I wrote:

> Valdis.Kletnieks@vt.edu wrote:
> 
> > 'cat' is probably doing a stat() on stdout and seeing it's connected
> > to /dev/null and not even bothering to do the write() call.  I've seen
> > similar behavior in other GNU utilities.
> 
> I can't see any special casing for /dev/null in cat's source, but I
> forgot to check dd with bigger block size. It's ok with bs=4096...

However with 2.4 dd performs fine even with bs=512.

-- 
Tobias						PGP: http://9ac7e0bc.2ya.com
Be vigilant!
np: PHILFUL3
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