netdev - Re: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

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Message-ID: <OFEC575300.46D36636-ON65257359.001958ED-65257359.001A303C@in.ibm.com>
Date:	Mon, 17 Sep 2007 10:16:02 +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,
	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: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

[Removing Jeff as requested from thread :) ]

Hi Dave,

David Miller <davem@...emloft.net> wrote on 09/17/2007 07:55:02 AM:

> From: jamal <hadi@...erus.ca>
> Date: Sun, 16 Sep 2007 22:14:21 -0400
>
> > I still think this work - despite my vested interest - needs more
> > scrutiny from a performance perspective.
>
> Absolutely.
>
> There are tertiary issues I'm personally interested in, for example
> how well this stuff works when we enable software GSO on a non-TSO
> capable card.
>
> In such a case the GSO segment should be split right before we hit the
> driver and then all the sub-segments of the original GSO frame batched
> in one shot down to the device driver.
>
> In this way you'll get a large chunk of the benefit of TSO without
> explicit hardware support for the feature.
>
> There are several cards (some even 10GB) that will benefit immensely
> from this.

I have tried this on ehca which does not support TSO. I added GSO flag at
the ipoib layer (and that resulted in a panic/fix that is mentioned in
this patchset). I will re-run tests for this and submit results.

Thanks,

- KK

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