Bug#540012: linux-image-2.6.30-1-amd64: Low disk perfromance, system unresponsible on some high io

[maximilian attems <max@stro.at>]

On Wed, Aug 05, 2009 at 10:32:29AM +0400, Paul Romanchenko wrote:
> Package: linux-image-2.6.30-1-amd64
> Version: 2.6.30-1
> Severity: important
> 
> Simple test:
> $ dd if=/dev/zero of=./test.img bs=572041216 count=1
> 1+0 records in
> 1+0 records out
> 572041216 bytes (572 MB) copied, 24.3899 seconds, 23.5 MB/s
> 
> It takes 24 seconds to write 572MB. During the dd, the system is
> almost unresponsible, even Ctrl-C can't breake the operation.
> During regular work, any io load (swapping/paging) freeze the system.
> 
> Disk is not so bad:
> 
> $ sudo hdparm -t /dev/sda
> 
> /dev/sda:
>  Timing buffered disk reads:  268 MB in  3.02 seconds =  88.84 MB/sec
> 
> Here is scheduler used (i tried all, 1-2 MB/s changes):
> $ cat /sys/block/sda/queue/scheduler
> noop [anticipatory] deadline cfq
> 
> Some fs info
> $ mount | grep sda
> /dev/sda1 on / type ext3 (rw,relatime,errors=remount-ro)
> 

could you try 2.6.31-rc5 from buildserver, see trunk apt lines:
http://wiki.debian.org/DebianKernel