netdev - Re: Receive side performance issue with multi-10-GigE and NUMA

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Message-ID: <20090826233007.GA5082@elte.hu>
Date:	Thu, 27 Aug 2009 01:30:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	rostedt@...dmis.org, nhorman@...driver.com, fweisbec@...il.com,
	billfink@...dspring.com, netdev@...r.kernel.org, brice@...i.com,
	gallatin@...i.com
Subject: Re: Receive side performance issue with multi-10-GigE and NUMA


* David Miller <davem@...emloft.net> wrote:

> From: Steven Rostedt <rostedt@...dmis.org>
> Date: Wed, 26 Aug 2009 19:05:20 -0400 (EDT)
> 
> > How about Neil try out doing all he can with the existing TRACE_EVENT 
> > work. I'm sure Ingo and myself would be fine with helping him with any 
> > issues he comes up with. If there is something that he hates about it, 
> > that really makes his user space code messy, then he can put the ball back 
> > in our court, and Ingo and I will need to come up with a solution.
> > 
> > If we truly hit a show stopper, than we can always fall back to the ftrace 
> > plugin. But until we find out for sure that TRACE_EVENT is not good 
> > enough, then we should try that out.
> > 
> > How's that sound?
> 
> That works for me, thanks Steven!
> 
> I'll revert Neil's change from net-next-2.6 and we can work on a 
> usable solution, long-term.

thanks David!

Also, my prior offer to help out with the TRACE_EVENT conversion 
stands as well, plus more TRACE_EVENT() tracepoints would be welcome 
too in the networking code.

It's a very useful feature and they are a lot easier (and more 
decentralized) to add than new tracing plugins.

Thanks,

	Ingo
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