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

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Message-ID: <467FF23B.30509@imap.cc>
Date:	Mon, 25 Jun 2007 18:50:03 +0200
From:	Tilman Schmidt <tilman@...p.cc>
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

Ingo Molnar <mingo@...e.hu> wrote:
> so how about the following, different approach: anyone who has a tasklet 
> in any performance-sensitive codepath, please yell now.

The Siemens Gigaset ISDN base driver uses tasklets in its isochronous
data paths. These will be scheduled for each completion of an isochronous
URB, or every 8 msec for each of the four isochronous pipes if both B
channels are connected. The driver uses three URBs for each pipe, always
maintaining two in flight while processing the third one. So the tasklet
has to run within 16 ms from being scheduled in order to avoid packet
loss (in the receive path) or data underrun (in the transmit path).

Does that qualify as performance sensitive for the purpose of this
discussion?

Thanks,
Tilman

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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