netdev - Re: [RFC] New driver API to speed up small packets xmits

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Date:	Fri, 11 May 2007 12:44:58 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	David Stevens <dlstevens@...ibm.com>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Krishna Kumar2 <krkumar2@...ibm.com>, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org, Rick Jones <rick.jones2@...com>
Subject: Re: [RFC] New driver API to speed up small packets xmits


(Mistaken didn't reply-all previous time)

Hi Dave,

David Stevens <dlstevens@...ibm.com> wrote on 05/11/2007 02:57:56 AM:

> The word "small" is coming up a lot in this discussion, and
> I think packet size really has nothing to do with it. Multiple
> streams generating packets of any size would benefit; the
> key ingredient is a queue length greater than 1.

Correct. Re-thinking about this - for larger packets the bandwidth
may not improve as it reaches line-speed, but I guess CPU util could
reduce (which could reduce in small packet case too). Using "small"
was not covering this case.

Thanks,

- KK

> I think the intent is to remove queue lock cycles by taking
> the whole list (at least up to the count of free ring buffers)
> when the queue is greater than one packet, thus effectively
> removing the lock expense for n-1 packets.


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