netdev - Re: [PATCHES] TX batching

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Message-ID: <OF568108F3.5706A2B5-ON6525736F.002CED41-6525736F.002D492F@in.ibm.com>
Date:	Tue, 9 Oct 2007 13:44:38 +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,
	Evgeniy Polyakov <johnpol@....mipt.ru>, 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: [PATCHES] TX batching

J Hadi Salim <j.hadi123@...il.com> wrote on 10/08/2007 07:35:20 PM:

> I dont see something from Krishna's approach that i can take and reuse.
> This maybe because my old approaches have evolved from the same path.
> There is a long list but as a sample: i used to do a lot more work while
> holding the queue lock which i have now moved post queue lock; i dont
> have any speacial interfaces/tricks just for batching, i provide hints
> to the core of how much the driver can take etc etc. I have offered
> Krishna co-authorship if he makes the IPOIB driver to work on my
> patches, that offer still stands if he chooses to take it.

My feeling is that since the approaches are very different, it would
be a good idea to test the two for performance. Do you mind me doing
that? Ofcourse others and/or you are more than welcome to do the same.

I had sent a note to you yesterday about this, please let me know
either way.

******************* Previous mail ******************

Hi Jamal,

If you don't mind, I am trying to run your approach vs mine to get some
results
for comparison.

For starters, I am having issues with iperf when using your infrastructure
code with
my IPoIB driver - about 100MB is sent and then everything stops for some
reason.
The changes in the IPoIB driver that I made to support batching is to set
BTX, set
xmit_win, and dynamically reduce xmit_win on every xmit and increase
xmit_win on
every xmit completion. Is there anything else that is required from the
driver?

thanks,

- KK

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