On Sun, 24 Jun 2007 19:27:23 +0200 Patrick Mau <[email protected]> wrote:
> Good afternoon
>
> Following is a small patch to "ll_rw_block" I played around with.
> I started using "blktrace" to analyse the performance of my dated
> LVM / MD / SCSI setup. It's really a nice tool, by the way.
>
> The changes are:
>
> * Change the "q->unplug_thresh" to be halve of "q->nr_requets".
> This dynamically delays unplugging. It was hardcoded to 4 and
> makes a difference in performace because of higher merge counts.
>
> * Change the unplug timeout to 10 milliseconds.
> This is of course questionable, but I don't know why 3 was
> choosen in the first place. I just played with it.
>
> * Set the congestion on/off limits further apart.
>
> * Cleanup the congestion checks (no "+1" anymore, more readable).
>
> * Update "q->unplug_thresh" whenever "q->nr_requests" is updated
> through sysfs.
I don't think anyone has played with these settings since they first went
in and yes, there may be some benefits available here.
> I did various artifical benchmarksi, mostly tar, dd and cp (also to NFS).
> Comments are welcome.
umm, what was the result of this benchmarking? That is rather important
information ;)
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