On Tue, 02 Sep 2003 13:13:19 -0400
Marvin Blackburn <[EMAIL PROTECTED]> wrote:
> We have a problem where the load shoots up as well as sys cpu when we do
> some large sequential copies.
> We are copying two 500MB files from point a to point b. Both filesystems
> are ext3 on raid 5.
>
> Does anyone have any ideas on what kernel tuneables might help with this
> problem, or what mount options my be helpful.
> Thanks.
>
Hi Marvin,
Are you using IDE drives ? Have you made sure that DMA is enabled
on them ? If not all such copies have to pass through the CPU and you'll
see the kind of load you're talking about. The command:
hdparm /dev/hda
(substitute proper drive name) will tell you if this is the case. To enable DMA
on this drive:
hdparm -d1 /dev/hda
Cheers,
Sean
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