Thanks much. I still seem to be getting latency, etc. w/ 2.6.11 rc1 bk 
w/ the patch... Here you go (vmstat.log is a little long).

Jens Axboe wrote:
> On Wed, Jan 12 2005, Paul A. Sumner wrote:
> 
>>Thanks... I've tried the as, deadline and cfq schedulers. Deadline is
>>giving me the best results. I've also tried tweaking the stuff in
>>/sys/block/sda/queue/iosched/.
>>
>>For lack of a better way of describing it, it seems like something is
>>thrashing.
> 
> 
> I you have time, I would like you to try current BK with this patch:
> 
> http://www.kernel.org/pub/linux/kernel/people/axboe/patches/v2.6/2.6.11-rc1/cfq-time-slices-20.gz
> 
> You should enable CONFIG_IOPRIO_WRITE, it is in the io scheduler config
> section, if you do a make oldconfig it should pop up for you. Boot with
> elevator=cfq to select cfq.
> 
> A simple profile of the bad period would also be nice, along with
> vmstat 1 info from that period. If you boot with profile=2, do:
> 
> # readprofile -r
> # run bad workload
> # readprofile | sort -nr +2 > result_file
> 
> And send that along with the logged vmstat 1 from that same period.
> 
> Oh, and lastly, remember to CC people on lkml when you respond, thanks.
>