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

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Date:	Wed, 8 Aug 2007 16:39:47 +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 08/08/2007 04:19:00 PM:

> From: Krishna Kumar <krkumar2@...ibm.com>
> Date: Wed, 08 Aug 2007 15:01:14 +0530
>
> > RESULTS: The performance improvement for TCP No Delay is in the range
of -8%
> >    to 320% (with -8% being the sole negative), with many individual
tests
> >    giving 50% or more improvement (I think it is to do with the hw
slots
> >    getting full quicker resulting in more batching when the queue gets
> >    woken). The results for TCP is in the range of -11% to 93%, with
most
> >    of the tests (8/12) giving improvements.
>
> 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?
>
> I personally don't think it will help for that case at all as
> TSO likely does better job of coalescing the work _and_ reducing
> bus traffic as well as work in the TCP stack.

Definitely, I will try to do this.

What do you generally think of the patch/implementation ? :)

thanks,

- KK

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