linux-kernel - Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

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Date:	Thu, 28 Jun 2007 18:00:31 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dan Williams <dan.j.williams@...el.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	john stultz <johnstul@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, kuznet@....inr.ac.ru,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues


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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