linux-kernel - Re: [PATCH RT] convert RCU Preempt tasklet into softirq.

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Message-ID: <20070608150010.GA24579@linux.vnet.ibm.com>
Date:	Fri, 8 Jun 2007 08:00:10 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...sign.ru>,
	LKML <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	RT <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH RT] convert RCU Preempt tasklet into softirq.

On Thu, Jun 07, 2007 at 09:16:51PM -0700, Paul E. McKenney wrote:
> On Thu, Jun 07, 2007 at 04:16:09PM -0400, Steven Rostedt wrote:
> > On Thu, 2007-06-07 at 14:51 -0400, Steven Rostedt wrote:
> > 
> > > There might still be an issue here. With the patch I'm getting a really
> > > slow response time on networking. But that be because of other patches I
> > > have applied.
> > 
> > I removed this patch and I can still get the network slowdown/hang. So
> > this patch is unrelated to this issue. RCU on the otherhand has not been
> > cleared of suspicion.
> 
> Might the slowdown be due to different kernel threads running at different
> priorities?  I could easily believe that changing the priority of the
> kernel thread processing RCU callbacks could have a noticeable effect
> on performance in some cases.
> 
> In other news, passed a set of kernbenches at this end, so starting
> an rcutorture.

And rcutorture passed 8 hours on a 4-CPU Opteron box.

							Thanx, Paul
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