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Re: performance degraded 2.4.8 -> 2.4.9?

To: Dan Yocum <yocum@xxxxxxxx>
Subject: Re: performance degraded 2.4.8 -> 2.4.9?
From: Tommy Wu <newsletter@xxxxxxxxxxxxxx>
Date: Thu, 15 Nov 2001 10:08:47 +0800
Cc: xfs-list <linux-xfs@xxxxxxxxxxx>
In-reply-to: <3BF1A6F2.273B49C4@xxxxxxxx>
Organization: TeaTime Development
References: <3BF1A6F2.273B49C4@xxxxxxxx>
Reply-to: tommy@xxxxxxxxxxxxxx
Sender: owner-linux-xfs@xxxxxxxxxxx
Dan Yocum <yocum@xxxxxxxx> wrote:

> What happened between 2.4.8 and 2.4.9 that the disk I/O performance would
> *dramatically* drop?  With 2.4.8 I'm getting ~34MB/s writes and ~160MB/s
> reads.  As of 2.4.9 this has dropped to ~10MB/s writes and 80-100MB/s
> reads.  That's pretty bad.  The problem was not fixed with 2.4.10 and is
> still the same as of 2.4.13pre6 - I haven't checked the latest in a couple
> weeks, maybe it's better?
> I've decided to drop back to 2.4.5 since 2.4.8 was regularly crashing the
> machines, the "kernel: __alloc_pages: 3-order allocation failed." errors
> seem to have gone away, and the performance is right up there.  

   I've got the same problem in 2.4.8, 2.4.9, 2.4.10...  and plus a 
   xfs_force_shutdown problem in 2.4.9 in last month....
   I change my kernel to 2.4.8mdk from mandrank (base on -ac)... last month.
   It work great for me now! Running on a P3 1G SMP system with 1G ram
   for Oracle 9i.


    Tommy Wu
    ICQ: 22766091
    Mobile Phone: +886 936 909490
    TeaTime BBS +886 2 31515964 24Hrs V.Everything

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