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Date: Thu, 23 Aug 2007 20:34:25 -0700 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: hadi@...erus.ca Cc: David Miller <davem@...emloft.net>, 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, mcarlson@...adcom.com, mchan@...adcom.com, netdev@...r.kernel.org, peter.p.waskiewicz.jr@...el.com, rdreier@...co.com, Robert.Olsson@...a.slu.se, sri@...ibm.com, tgraf@...g.ch, xma@...ibm.com Subject: Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB On Thu, 23 Aug 2007 18:38:22 -0400 jamal <hadi@...erus.ca> wrote: > On Thu, 2007-23-08 at 15:30 -0700, David Miller wrote: > > From: jamal <hadi@...erus.ca> > > Date: Thu, 23 Aug 2007 18:04:10 -0400 > > > > > 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). > > > > I don't see how this can matter. > > > > TSO only ever does anything if you accumulate more than one MSS > > worth of data. > > I stand corrected then. > > cheers, > jamal > For most normal Internet TCP connections, you will see only 2 or 3 packets per TSO because of ACK clocking. If you turn off delayed ACK on the receiver it will be even less. A current hot topic of research is reducing the number of ACK's to make TCP work better over asymmetric links like 3G. -- Stephen Hemminger <shemminger@...ux-foundation.org> - 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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