Re: Data corruption issue with splice() on 2.6.27.10

From: Jarek Poplawski
Date: Tue Jan 06 2009 - 05:01:31 EST


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.

Jarek P.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/