From: "Sven Köhler" <skoehler@upb.de>
To: linux-kernel@vger.kernel.org
Subject: Re: cat /dev/hdb > /dev/null DoS
Date: Fri, 09 Apr 2004 02:10:55 +0200 [thread overview]
Message-ID: <c54pi2$u9b$1@sea.gmane.org> (raw)
In-Reply-To: <c539ur$h5e$1@sea.gmane.org>
> i guess you have DMA enabled on /dev/hdb. I would expect, that the
> system is at least 50% idle
i did
dd if=/dev/hda of=/dev/null bs=1M
and noticed, that top shows 0% idle, but 95% wa - what ever that means.
Since i've got DMA turned on, i would expect the CPU to be 95% idle,
instead 95% wa? what does "wa" stand for?
next prev parent reply other threads:[~2004-04-09 0:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-08 8:55 cat /dev/hdb > /dev/null DoS Karel Kulhavý
2004-04-08 10:36 ` Sven Köhler
2004-04-09 0:10 ` Sven Köhler [this message]
2004-04-09 6:47 ` Denis Vlasenko
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