Date: Thu, 24 Jul 2003 23:49:40 -0400
From: Jeff Sipek <jeffpc@optonline.net>
Subject: Re: Net device byte statistics
In-reply-to: <E19ftDj-00016j-00@calista.inka.de>
To: Bernd Eckenfels <ecki@calista.eckenfels.6bone.ka-ip.net>,
       linux-kernel@vger.kernel.org
Message-id: <200307242349.48394.jeffpc@optonline.net>
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On Thursday 24 July 2003 23:26, Bernd Eckenfels wrote:
> In article <200307250437.50928.fredrik@dolda2000.cjb.net> you wrote:
> > I almost thought that would be it. I do understand that that code needs
> > to be really clean, but, correct me if I'm wrong, but isn't GCC's long
> > long implementation efficient enough to only add minimal overhead to
> > that?
>
> I think there is mainly an issue with atomic incremets. I am not sure if
> the counter can be incremeted concurrently, or if the code path would be
> serialized, but there is always the reading side, which may need to retry
> an read. Besides that, the counter is in the fast path, so it will add some
> delay to packet handling.
>
> I guess a 64bit implementation will need to be a per-cpu solution.

I am actually working on it.

Jeff.

- -- 
You measure democracy by the freedom it gives its dissidents, not the
freedom it gives its assimilated conformists.
		- Abbie Hoffman
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