netdev - Re: [RFC][NET_SCHED] explict hold dev tx lock

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Message-ID: <20070917135850.GA19380@2ka.mipt.ru>
Date:	Mon, 17 Sep 2007 17:58:51 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	jamal <hadi@...erus.ca>
Cc:	David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org, kaber@...sh.net, dada1@...mosbay.com
Subject: Re: [RFC][NET_SCHED] explict hold dev tx lock

On Mon, Sep 17, 2007 at 09:03:58AM -0400, jamal (hadi@...erus.ca) wrote:
> > Did I understand you right, that you replaced trylock with lock and
> > thus removed collision handling and got better results?
> 
> Yes, a small one with the 4 CPUs and no irq binding. Note that in the
> test cases i run, the contention for queue lock was high (since all CPUs
> were busy processing traffic). 
> I think as the the number of CPUs go up, this will become more
> prominent. The choice is between contending for queue lock or this lock.
> One lock is contended by max of two cpus, the other by N cpus. As N goes
> up, you want to have more mercy on the one that is contended by N cpus.
> Did that make sense?

I think if number of cpus grows and there is no interupt binding, system
will not scale very well anyway, but your description makes sense,
thanks.

-- 
	Evgeniy Polyakov
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