From: Paolo Ornati <ornati@lycos.it>
To: Jaakko Helminen <haukkari@ihme.org>
Subject: Re: i/o wait eating all of CPU on 2.6.1
Date: Sun, 25 Jan 2004 15:37:50 +0100
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On Sunday 25 January 2004 15:30, Jaakko Helminen wrote:
> I have two servers, both of which have more than 300 gigabytes of hard
> drive space and those files are made available to the network with samba,
> nfs and http and it worked fine with 2.6.0 but when I upgraded to 2.6.1 I
> noticed that everything was VERY slow, from a machine that is connected
> to the other server with a 100M link, 57kB/s tops. i/o wait eats up all
> of the cpu. On the other hand, Apache (and everything else) works very
> fast when I only send /dev/zero to a client, since that doesn't need disk
> operations.
>
> I don't notice anything suspicious in dmesg but since this happens on two
> machines and has only happened when upgraded to 2.6.1, it's most likely
> because of 2.6.1. I'm downgrading to 2.6.0 (with mremap-patch) today if I
> don't figure out what is wrong. Any ideas?

Is DMA enabled with 2.6.1 on these two machines?

-- 
	Paolo Ornati
	Linux v2.6.2-rc1-mm3

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