I/O or Threading Suffer

[Dennis Berger]

On Wed, Jul 21, 2004 at 01:46:12AM +0200, jesk wrote:
> hi,
> i figured out that the performanceloss only really occur if the process is
> heavily writing on the filesystem.
> dd if=/dev/zero of=/dev/null bs=128k doesnt hurt much in responsetime
> of parallel processes, but when dd operates on the filesystem with of=foo
> every process will be affect in executiontime.
> a simple ps or ls meanwhile dding onto the disk will be hang for dozen of
> seconds.
> 
> i tested it with 4BSD and ULE with and without Preemption.
yep same thing here, it seems the process ( the "ps" one) doesn't get cputime
or something strange.

-db
> 
> 
> _______________________________________________
> freebsd-current at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe at freebsd.org"