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Message-ID: <20070605122031.GE9909@kernel.dk> Date: Tue, 5 Jun 2007 14:20:31 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: netdev@...r.kernel.org Subject: Re: [PATCH][RFC] network splice receive On Tue, Jun 05 2007, Jens Axboe wrote: > On Tue, Jun 05 2007, Jens Axboe wrote: > > Seems to work reasonably well for me, sometimes I do see small ranges > > inside the output file that are not correct, but I haven't been able to > > reproduce today. I think it has to do with page reuse, hence the > > NET_COPY_SPLICE ifdef that you can enable to just plain copy the data > > instead of referencing it. > > I managed to reproduce. It's segments of 68-80 bytes beyond corrupt in > the middle of the out, and there might be 1-3 of such occurences in the > 30mb file I tested with. The first 16 bytes of the corruption are always > the same: > > 0000 1800 4ff3 937f e000 6381 7275 0008 > > Perhaps that hex pattern rings a bell with someone intimate with the > networking. The remaining wrong bytes don't seem to have anything in > common. Ok, the source mac address is 00:18:F3:4F:7F:93 and the destination is 00:E0:81:63:75:72 which are the middle 12 bytes of the 16. Hope that helps someone clue me in as to which network part is reusing the data. Do I need to 'pin' the sk_buff until the pipe data has been consumed? -- Jens Axboe - 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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