netdev - Re: [PATCH 2/3][NET_BATCH] net core use batching

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Date:	Mon, 08 Oct 2007 09:17:24 -0400
From:	jamal <hadi@...erus.ca>
To:	Krishna Kumar2 <krkumar2@...ibm.com>
Cc:	David Miller <davem@...emloft.net>, gaagaan@...il.com,
	general@...ts.openfabrics.org, herbert@...dor.apana.org.au,
	jagana@...ibm.com, jeff@...zik.org, johnpol@....mipt.ru,
	Patrick McHardy <kaber@...sh.net>, kumarkr@...ux.ibm.com,
	mcarlson@...adcom.com, mchan@...adcom.com, netdev@...r.kernel.org,
	peter.p.waskiewicz.jr@...el.com, randy.dunlap@...cle.com,
	rdreier@...co.com, rick.jones2@...com, Robert.Olsson@...a.slu.se,
	shemminger@...ux-foundation.org, sri@...ibm.com, tgraf@...g.ch,
	xma@...ibm.com
Subject: Re: [PATCH 2/3][NET_BATCH] net core use batching

On Mon, 2007-08-10 at 10:33 +0530, Krishna Kumar2 wrote:

> > As a side note: Any batching driver should _never_ have to requeue; if
> > it does it is buggy. And the non-batching ones if they ever requeue will
> > be a single packet, so not much reordering.
> 
> On the contrary, batching LLTX drivers (if that is not ruled out) will very
> often requeue resulting in heavy reordering. Fix looks good though.

Two things: 
one, LLTX is deprecated (I think i saw a patch which says no more new
drivers should do LLTX) and i plan if nobody else does to kill 
LLTX in e1000 RSN. So for that reason i removed all code that existed to
support LLTX.
two, there should _never_ be any requeueing even if LLTX in the previous
patches when i supported them; if there is, it is a bug. This is because
we dont send more than what the driver asked for via xmit_win. So if it
asked for more than it can handle, that is a bug. If its available space
changes while we are sending to it, that too is a bug.

cheers,
jamal

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