On 6/28/07, Steven Rostedt <[email protected]> wrote:
On Thu, 28 Jun 2007, Dan Williams wrote:
> >
> Unfortunately setting the thread to real time priority makes
> throughput slightly worse. Instead of floating around 35MB/s the
> resync speed is stuck around 30MB/s:
That is really strange. If you higher the prio of the work queue it
gets worst? Something really strange is happening here? Are you using
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.
[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.
--
Dan
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