On Thu, 28 Jun 2007, Dan Williams wrote:
> > CONFIG_PREEMPT?
> >
> Everything thus far has been CONFIG_PREEMPT=n (the default for this platform).
>
> With CONFIG_PREEMPT=y the resync is back in the 50MB/s range.
So with upping the prio for the work queue you got back your performance?
>
> [iop-adma: hi-prio workqueue, CONFIG_PREEMPT=y]
> iq81340mc:~# cat /proc/mdstat
> Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
> md0 : active raid5 sdd[4] sdc[2] sdb[1] sda[0]
> 468872448 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
> [=>...................] recovery = 5.8% (9136404/156290816)
> finish=46.1min speed=53161K/sec
>
> The tasklet configuration stays in 50MB/s ballpark, and the default
> priority (nice -5) workqueue case remains in the 30's with
> CONFIG_PREEMPT=n.
[noted: should be CONFIG_PREEMPT=y]
This is expected. Seems you may have otherthings running at a higher prio.
-- Steve
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