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

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Message-ID: <OF5F233CB9.3A75A58F-ON87257332.00003442-88257332.00006C59@us.ibm.com>
Date:	Wed, 8 Aug 2007 17:06:41 -0700
From:	Shirley Ma <xma@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, gaagaan@...il.com,
	general@...ts.openfabrics.org, hadi@...erus.ca, jeff@...zik.org,
	johnpol@....mipt.ru, kaber@...sh.net, krkumar2@...ibm.com,
	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@...ux.vnet.ibm.com,
	tgraf@...g.ch, Venkata Jagana <jagana@...ibm.com>
Subject: Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB

Hello Herbert,

> > Not because I think it obviates your work, but rather because I'm
> > curious, could you test a TSO-in-hardware driver converted to
> > batching and see how TSO alone compares to batching for a pure
> > TCP workload?
> 
> You could even lower the bar by disabling TSO and enabling
> software GSO.

We had a discuss before. GSO doesn't benefit device which has no HW 
checksum (like IPoIB) by inducing an extra copy. And GSO benefits one 
stream, batching benefits multiple streams.

Thanks
Shirley
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