Comment 424 for bug 500069

(In reply to comment #262)
> (In reply to comment #261)
> Brandon, this test case doesn't seem to reproduce any significant latency
> issues for you. I suspect that 10k RPM disk is able to write fast enough to
> keep a significant amount of data from being buffered in memory. 1.5 seconds
> isn't great, but all my systems are at least 5 times worse than that and
> often
> 10-40 times worse.
>
> Do you notice a large latency hit on the system when the large write is
> running?
>
> Why are you running that second small write afterwards? Was the big write
> done
> at that point or not? The latency of your small writes does seem to vary by
> quite a bit.
>

The large write took a while to complete (about 10 minutes.. and only got to 5.3gig before I killed it), and yes, VERY degraded performance... took me a while to ssh in and kill it.. as local was almost unusable.

The first small write wasn't when the system started lagging out on me... it was when the ram usage was going up, and cpu usage was going up, so I decided to run it again at a later point just to see.

I can try doing the writes on my 7.2K RPM disc tomorrow when I'm back at work. just need to point the output to a different partition.