From: "Sven Köhler" <skoehler@upb.de>
To: linux-kernel@vger.kernel.org
Subject: Re: cat /dev/hdb > /dev/null DoS
Date: Thu, 08 Apr 2004 12:36:11 +0200 [thread overview]
Message-ID: <c539ur$h5e$1@sea.gmane.org> (raw)
In-Reply-To: <20040408085518.B4607@beton.cybernet.src>
> I did cat /dev/hdb > /dev/null and after a while (5 minutes),
> the system went totally unresponsive:
>
> 1) man top takes 3 minutes to display man page
> 2) Switching between console and X takes also a couple of minutes
> 3) top shows this:
>
> Cpu(s): 1.4% us, 1.4% sy, 0.0% ni, 0.0% id, 0.0% wa, 97.3% hi, 0.0% si
i guess you have DMA enabled on /dev/hdb. I would expect, that the
system is at least 50% idle
next prev parent reply other threads:[~2004-04-08 10:36 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 [this message]
2004-04-09 0:10 ` Sven Köhler
2004-04-09 6:47 ` Denis Vlasenko
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