From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: john stultz <johnstul@us.ibm.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Oleg Nesterov <oleg@tv-sign.ru>,
LKML <linux-kernel@vger.kernel.org>,
Dipankar Sarma <dipankar@in.ibm.com>,
RT <linux-rt-users@vger.kernel.org>
Subject: Re: [PATCH RT] convert RCU Preempt tasklet into softirq.
Date: Fri, 8 Jun 2007 08:00:10 -0700 [thread overview]
Message-ID: <20070608150010.GA24579@linux.vnet.ibm.com> (raw)
In-Reply-To: <20070608041651.GA19912@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2007-06-08 15:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1181180051.18444.31.camel@localhost.localdomain>
[not found] ` <20070607041411.GB1783@linux.vnet.ibm.com>
[not found] ` <1181226138.18444.54.camel@localhost.localdomain>
[not found] ` <20070607161754.GA11941@linux.vnet.ibm.com>
2007-06-07 18:26 ` [PATCH RT] convert RCU Preempt tasklet into softirq Steven Rostedt
2007-06-07 18:51 ` Steven Rostedt
2007-06-07 20:16 ` Steven Rostedt
2007-06-08 4:16 ` Paul E. McKenney
2007-06-08 15:00 ` Paul E. McKenney [this message]
2007-06-07 21:02 ` Paul E. McKenney
2007-06-08 15:27 ` Steven Rostedt
2007-06-08 19:36 ` Paul E. McKenney
2007-06-08 19:43 ` Steven Rostedt
2007-06-08 20:00 ` Paul E. McKenney
2007-09-06 17:52 ` Clark Williams
2007-09-06 18:06 ` Paul E. McKenney
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