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Date: Thu, 23 Aug 2007 18:04:10 -0400 From: jamal <hadi@...erus.ca> To: David Miller <davem@...emloft.net> Cc: rick.jones2@...com, krkumar2@...ibm.com, gaagaan@...il.com, general@...ts.openfabrics.org, 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, 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 On Wed, 2007-22-08 at 13:21 -0700, David Miller wrote: > From: Rick Jones <rick.jones2@...com> > Date: Wed, 22 Aug 2007 10:09:37 -0700 > > > Should it be any more or less worrysome than small packet > > performance (eg the TCP_RR stuff I posted recently) being rather > > worse with TSO enabled than with it disabled? > > That, like any such thing shown by the batching changes, is a bug > to fix. Possibly a bug - but you really should turn off TSO if you are doing huge interactive transactions (which is fair because there is a clear demarcation). The litmus test is the same as any change that is supposed to improve net performance - it has to demonstrate it is not intrusive and that it improves (consistently) performance. The standard metrics are {throughput, cpu-utilization, latency} i.e as long as one improves and others remain zero, it would make sense. Yes, i am religious for batching after all the invested sweat (and i continue to work on it hoping to demystify) - the theory makes a lot of sense. cheers, jamal - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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