i/o wait eating all of CPU on 2.6.1

From: Jaakko Helminen (haukkari_at_ihme.org)
Date: 01/25/04

  • Next message: Adrian Bunk: "Re: Kernels > 2.6.1-mm3 do not boot." 
    Date:	Sun, 25 Jan 2004 16:30:42 +0200
To: linux-kernel@vger.kernel.org

    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?

    And since I'm not subscribed to Linux Kernel Mailing List, please forward
    any replies to me.

    -Jaakko Helminen

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  • Next message: Adrian Bunk: "Re: Kernels > 2.6.1-mm3 do not boot."