System slowdown on large disk writes

[William O'Higgins Witteman]

On Wed, Mar 01, 2006 at 08:30:35PM -0500, John Van Ostrand wrote:
>On Wed, 2006-03-01 at 19:27 -0500, William O'Higgins Witteman wrote:
>> I have noticed that when doing huge IO operations I get a system
>> slowdown until the operation finishes.  I don't notice unless the
>> read/write (and it seems to have to be both) is really big, but it
>> bothers me that it slows my whole machine down.  A great way for me to
>> replicate it is to copy a DVD iso from one place to another (mv'ing it
>> obviously doesn't demonstrate the behaviour at all.)  I seem to have DMA
>> enabled, according to hdparm, so I'm curious as to what accounts for the
>> behaviour, and what I can do about it.  Thanks.
>
>What version of the kernel are you using and what distro?


Linux $hostname 2.6.15-1-k7 #1 Tue Feb 21 20:43:47 UTC 2006 i686 GNU/Linux

Debian testing.
-- 

yours,

William

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