linux-kernel - Re: 2.6.24-rc8-rt1

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Date:	Thu, 17 Jan 2008 21:01:41 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Daniel Walker <dwalker@...sta.com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc8-rt1

Steven Rostedt wrote:
> On Thu, 17 Jan 2008, Daniel Walker wrote:
> 
>> On Thu, 2008-01-17 at 19:17 +0100, Wolfgang Grandegger wrote:
>>> [    0.733248] TCP bind hash table entries: 2048 (order: 3, 57344
>>> bytes)
>>> [    0.741132] TCP: Hash tables configured (established 2048 bind
>>> 2048)
>>> [    0.747981] TCP reno registered
>>> [    0.805896] krcupreemptd setsched 0
>>> [    0.809657]   prio = 98
>> That's interesting .. You chould try running cyclictest at priority 99
>> to eliminate other threads that might get involved (using -p99 instead
>> of -p80 , I think) ..
>>
> 
> But, anotherthing to try is disabling CONFIG_PREEMPT_RCU_BOOST, and see if
> that fixes anything.

It did not really help:

   /cyclictest -n -p99 -i1000
  3.89 3.46 1.77 1/43 3830

  T: 0 (  916) P:99 I:1000 C: 520752 Min:     52 Act:  112 Avg:  105
Max:     960

Any other idea?

Wolfgang.

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