netdev - Re: bad networking related lag in v2.6.22-rc2

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Message-ID: <20070523110556.GA8653@elte.hu>
Date:	Wed, 23 May 2007 13:05:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Anant Nitya <kernel@...chanda.info>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: bad networking related lag in v2.6.22-rc2


* Patrick McHardy <kaber@...sh.net> wrote:

> How is this trace to be understood? Is it simply a call trace in 
> execution-order? [...]

yeah. There's a help section at the top of the trace which explains the 
other fields too:

                 _------=> CPU#
                / _-----=> irqs-off
               | / _----=> need-resched
               || / _---=> hardirq/softirq
               ||| / _--=> preempt-depth
               |||| /
               |||||     delay
   cmd     pid ||||| time  |   caller
      \   /    |||||   \   |   /
 privoxy-12926 1.Ns1    0us : ktime_get_ts (ktime_get)

the function name in braces is the parent function. So in this case the 
trace entry means we called ktime_get_ts() from ktime_get().

	Ingo
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