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

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Date:	Tue, 9 Oct 2007 08:39:31 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	hadi@...erus.ca
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

J Hadi Salim <j.hadi123@...il.com> wrote on 10/08/2007 06:47:24 PM:

> 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.

Driver might ask for 10 and we send 10, but LLTX driver might fail to get
lock and return TX_LOCKED. I haven't seen your code in greater detail, but
don't you requeue in that case too?

- KK

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