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Date: Tue, 6 Jan 2009 11:04:08 +0100 From: Willy Tarreau <w@....eu> To: Jarek Poplawski <jarkao2@...il.com> Cc: Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: Data corruption issue with splice() on 2.6.27.10 On Tue, Jan 06, 2009 at 10:01:13AM +0000, Jarek Poplawski wrote: > On Tue, Jan 06, 2009 at 10:41:38AM +0100, Willy Tarreau wrote: > ... > > > Great story! Alas I don't understand this fully either, but it seems > > > Changli Gao was concerned with sendpage sending this "as pages", so > > > when NETIF_F_SG flag is available. Did you try this without SG btw? > > > > No I did not. I can try, it's not too hard. It would in part defeat the > > purpose of the mechanism (especially at 10 Gbps) but at least it will > > help narrow the problem down. > > Yes, I meant it only as a proof of concept. BTW, delaying TCP acks a > bit for these sendpages should then make it more reproducible, I guess. ah ? I can try that too, using iptables on the target machine to drop a few outgoing acks. Regards, Willy -- 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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