Re: Read this and be ashamed ;) or: Awfull performance loss since 2.4.18 to 2.4.21-pre2

[Roy Sigurd Karlsbakk]

hi

What disk/controller is this?

On Sunday, December 22, 2002, at 02:47 PM, Marc-Christian Petersen 
wrote:

> Hi all,
>
> not much to say about, just read. All are vanilla kernels w/o any 
> patch.
>
> /dev/hda5 on /home type ext3 (rw,data=ordered)
> /dev/hda5             10080488    731488   8836932   8% /home
>
> UDMA100 IDE Drive, DMA is on. All these runs were done right after 
> bootup.
> Mashine is a Celeron 1,3GHz, 512MB RAM, 512MB SWAP.
>
> root@codeman:[/] # uname -r
> 2.4.18
> root@codeman:[/] # dd if=/dev/zero of=/home/largefile bs=16384 
> count=131072
> 131072+0 records in
> 131072+0 records out
> 2147483648 bytes transferred in 119.140681 seconds (18024772 bytes/sec)
> root@codeman:[/] #
>
> root@codeman:[/] # uname -r
> 2.4.19
> root@codeman:[/] # dd if=/dev/zero of=/home/largefile bs=16384 
> count=131072
> 131072+0 records in
> 131072+0 records out
> 2147483648 bytes transferred in 140.305836 seconds (15305733 bytes/sec)
>
> root@codeman:[/] # uname -r
> 2.4.20
> root@codeman:[/] # dd if=/dev/zero of=/home/largefile bs=16384 
> count=131072
> 131072+0 records in
> 131072+0 records out
> 2147483648 bytes transferred in 172.327570 seconds (12461637 bytes/sec)
>
> root@codeman:[/] # uname -r
> 2.4.21-pre2
> root@codeman:[/] # dd if=/dev/zero of=/home/largefile bs=16384 
> count=131072
> 131072+0 records in
> 131072+0 records out
> 2147483648 bytes transferred in 177.743959 seconds (12081894 bytes/sec)
>
>
> ciao, Marc
> -
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