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Message-ID: <10203.1182816012@lwn.net>
Date: Mon, 25 Jun 2007 18:00:12 -0600
From: corbet@....net (Jonathan Corbet)
To: Ingo Molnar <mingo@...e.hu>
Cc: Steven Rostedt <rostedt@...dmis.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>, matthew.wilcox@...com,
kuznet@....inr.ac.ru,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues
A couple of days ago I said:
> The cafe_ccic (OLPC) camera driver uses a tasklet to move frames out of
> the DMA buffers in the streaming I/O path....
>
> Obviously some testing is called for here. I will make an attempt to do
> that testing
I've done that testing - I have an OLPC B3 unit running V2 of the
tasklet->workqueue patch, and all seems well. 30 FPS to the display and
no dropped frames. The tasklets/0 process is running 3-5% CPU, in case
that's interesting. For whatever reason, I see about 3% *more* idle
time when running just mplayer than I did without the patch.
Consider my minor qualms withdrawn, there doesn't seem to be any trouble
in this area.
Thanks,
jon
Jonathan Corbet / LWN.net / corbet@....net
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