Messages in this thread | | | Date | Thu, 28 Jun 2007 14:23:54 -0700 | From | "Dan Williams" <> | Subject | Re: [RFC PATCH 0/6] Convert all tasklets to workqueues |
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On 6/28/07, Steven Rostedt <rostedt@goodmis.org> 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.
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