netdev - Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB

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Message-ID: <OFC19F468C.48FB78EE-ON6525733F.0016047F-6525733F.00170F48@in.ibm.com>
Date:	Wed, 22 Aug 2007 09:41:52 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	gaagaan@...il.com, general@...ts.openfabrics.org, hadi@...erus.ca,
	herbert@...dor.apana.org.au, jagana@...ibm.com, jeff@...zik.org,
	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, 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 0/9 Rev3] Implement batching skb API and support in IPoIB

David Miller <davem@...emloft.net> wrote on 08/22/2007 12:21:43 AM:

> From: jamal <hadi@...erus.ca>
> Date: Tue, 21 Aug 2007 08:30:22 -0400
>
> > On Tue, 2007-21-08 at 00:18 -0700, David Miller wrote:
> >
> > > Using 16K buffer size really isn't going to keep the pipe full enough
> > > for TSO.
> >
> > Why the comparison with TSO (or GSO for that matter)?
>
> Because TSO does batching already, so it's a very good
> "tit for tat" comparison of the new batching scheme
> vs. an existing one.

I am planning to do more testing on your suggestion over the
weekend, but I had a comment. Are you saying that TSO and
batching should be mutually exclusive so hardware that doesn't
support TSO (like IB) only would benefit?

But even if they can co-exist, aren't cases like sending
multiple small skbs better handled with batching?

Thanks,

- KK

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