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

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Date:	Thu, 10 May 2007 14:45:17 -0700
From:	Rick Jones <rick.jones2@...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
Subject: Re: [RFC] New driver API to speed up small packets xmits

David Stevens wrote:
> 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.
> 
> 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.

Which worked _very_ well (the whole list) going in the other direction for the 
netisr queue(s) in HP-UX 10.20.  OK, I promise no more old HP-UX stories for the 
balance of the week :)

Taking some count of the list might be a triffle too complicated.

rick jones
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