Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756970AbZAGMyZ (ORCPT ); Wed, 7 Jan 2009 07:54:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752263AbZAGMyM (ORCPT ); Wed, 7 Jan 2009 07:54:12 -0500 Received: from rhun.apana.org.au ([64.62.148.172]:34027 "EHLO arnor.apana.org.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751019AbZAGMyM (ORCPT ); Wed, 7 Jan 2009 07:54:12 -0500 Date: Wed, 7 Jan 2009 23:53:56 +1100 From: Herbert Xu To: Willy Tarreau Cc: Evgeniy Polyakov , Jens Axboe , Jarek Poplawski , Changli Gao , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: Data corruption issue with splice() on 2.6.27.10 Message-ID: <20090107125356.GB26235@gondor.apana.org.au> References: <20090106085442.GA9513@ff.dom.local> <20090106094138.GE25644@1wt.eu> <20090106100112.GB9513@ff.dom.local> <20090106155715.GA28783@1wt.eu> <20090107093915.GA6899@ff.dom.local> <20090107122205.GA6051@1wt.eu> <20090107123153.GA9597@ff.dom.local> <20090107123504.GN32491@kernel.dk> <20090107124034.GB31255@ioremap.net> <20090107125201.GB6307@1wt.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090107125201.GB6307@1wt.eu> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1137 Lines: 24 On Wed, Jan 07, 2009 at 01:52:01PM +0100, Willy Tarreau wrote: > > Evgeniy, I'd like to understand something related to our apparent lack of > knowledge of when the data is effectively transmitted. If we're focusing > on the send part, I can't understand why I never reproduce the corruption > when the data source is a file or loopback, but I only see it when the source > is an ethernet interface. How is it possible that a problem affecting only It doesn't happen with a file because in that case you don't start with an skb so there is no skb->head. It probably doesn't happen with loopback because loopback does GSO so again skb->head does not exist (so to speak). Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/