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From: "Chris Friesen" <cfriesen@nortel.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
	netdev@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Steven Rostedt <rostedt@goodmis.org>,
	linuxppc-dev@ozlabs.org, paulus@samba.org,
	Thomas Gleixner <tglx@linutronix.de>,
	David Miller <davem@davemloft.net>
Subject: Re: question about softirqs
Date: Wed, 13 May 2009 13:44:59 -0600	[thread overview]
Message-ID: <4A0B233B.8010105@nortel.com> (raw)
In-Reply-To: <20090513191354.GB19296@one.firstfloor.org>

Andi Kleen wrote:
> On Wed, May 13, 2009 at 01:04:09PM -0600, Chris Friesen wrote:
>> Andi Kleen wrote:
>>
>>> network packets are normally processed by the network packet interrupt's
>>> softirq or alternatively in the NAPI poll loop.
>> If we have a high priority task, ksoftirqd may not get a chance to run.
> 
> In this case the next interrupt will also process them. It will just
> go more slowly because interrupts limit the work compared to ksoftirqd.

I realize that they will eventually get processed.  My point is that the
documentation (in-kernel, online, and in various books) says that
softirqs will be processed _on the return from a syscall_.  As we all
agree, this is not necessarily the case.

Chris

  reply	other threads:[~2009-05-13 19:44 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-08 22:51 question about softirqs Chris Friesen
2009-05-08 23:05 ` David Miller
2009-05-08 23:34 ` Paul Mackerras
2009-05-08 23:53   ` David Miller
2009-05-09  2:52     ` Benjamin Herrenschmidt
2009-05-09  3:31     ` Paul Mackerras
2009-05-09  6:48       ` David Miller
2009-05-11 18:25         ` Chris Friesen
2009-05-11 23:24           ` David Miller
2009-05-12  0:43             ` Chris Friesen
2009-05-12  8:12               ` Ingo Molnar
2009-05-12  8:12                 ` Ingo Molnar
2009-05-12  9:12                 ` Peter Zijlstra
2009-05-12  9:23                   ` Ingo Molnar
2009-05-12  9:32                     ` Peter Zijlstra
2009-05-12 12:20                       ` Steven Rostedt
2009-05-12 12:20                         ` Steven Rostedt
2009-05-13  4:45                         ` David Miller
2009-05-13  4:44                     ` David Miller
2009-05-13  4:44                       ` David Miller
2009-05-13  5:15                       ` Paul Mackerras
2009-05-13  5:15                         ` Paul Mackerras
2009-05-13  5:28                         ` David Miller
2009-05-13  5:28                           ` David Miller
2009-05-13  5:55                   ` Evgeniy Polyakov
2009-05-13  5:55                     ` Evgeniy Polyakov
2009-05-12 15:18                 ` Chris Friesen
2009-05-12 15:18                   ` Chris Friesen
2009-05-13  8:34                   ` Andi Kleen
2009-05-13  8:34                     ` Andi Kleen
2009-05-13 13:23                     ` Chris Friesen
2009-05-13 14:15                       ` Andi Kleen
2009-05-13 14:15                         ` Andi Kleen
2009-05-13 14:17                         ` Thomas Gleixner
2009-05-13 14:17                           ` Thomas Gleixner
2009-05-13 14:24                           ` Andi Kleen
2009-05-13 14:24                             ` Andi Kleen
2009-05-13 14:54                             ` Eric Dumazet
2009-05-13 14:54                               ` Eric Dumazet
2009-05-13 15:02                               ` Andi Kleen
2009-05-13 15:02                                 ` Andi Kleen
2009-05-13 15:05                             ` Chris Friesen
2009-05-13 15:54                               ` Thomas Gleixner
2009-05-13 15:54                                 ` Thomas Gleixner
2009-05-13 16:10                                 ` Chris Friesen
2009-05-13 17:01                               ` Andi Kleen
2009-05-13 19:04                                 ` Chris Friesen
2009-05-13 19:04                                   ` Chris Friesen
2009-05-13 19:13                                   ` Andi Kleen
2009-05-13 19:13                                     ` Andi Kleen
2009-05-13 19:44                                     ` Chris Friesen [this message]
2009-05-13 19:53                                       ` Andi Kleen
2009-05-13 19:53                                         ` Andi Kleen
2009-05-13 20:55                                         ` Thomas Gleixner
2009-05-13 20:55                                           ` Thomas Gleixner
2009-05-11 23:34           ` Paul Mackerras
2009-05-09  0:28   ` Chris Friesen

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