Return-Path: Delivered-To: apmail-apr-dev-archive@apr.apache.org Received: (qmail 87930 invoked by uid 500); 5 Dec 2002 16:17:38 -0000 Mailing-List: contact dev-help@apr.apache.org; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Delivered-To: mailing list dev@apr.apache.org Received: (qmail 87911 invoked from network); 5 Dec 2002 16:17:37 -0000 X-Authentication-Warning: radish.cambridge.redhat.com: jorton set sender to jorton@redhat.com using -f Date: Thu, 5 Dec 2002 16:17:53 +0000 From: Joe Orton To: dev@httpd.apache.org, dev@apr.apache.org Subject: Re: Linux + TCP_CORK + IPv6 = Broken [PATCH] Message-ID: <20021205161753.GI4906@redhat.com> Mail-Followup-To: dev@httpd.apache.org, dev@apr.apache.org References: <20021204122549.A28623@prodigy.Redbrick.DCU.IE> <20021204123039.A14108@prodigy.Redbrick.DCU.IE> <20021204230521.GA619@redhat.com> <20021204233806.A12474@prodigy.Redbrick.DCU.IE> <20021205071602.GA2919@redhat.com> <20021205105453.A27661@prodigy.Redbrick.DCU.IE> <20021205113029.GA4776@redhat.com> <20021205125848.A14650@prodigy.Redbrick.DCU.IE> <20021205131635.A18227@prodigy.Redbrick.DCU.IE> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20021205131635.A18227@prodigy.Redbrick.DCU.IE> User-Agent: Mutt/1.4i X-Spam-Rating: daedalus.apache.org 1.6.2 0/1000/N To summarize some off-list dicussion - the kernel guys have said that using sendfile on IPv6 sockets may trigger bugs in cards which do hardware TCP checksumming for card/driver/OS combinations which support that. (since the cards have to know about IPv6, and that probably doesn't get tested much). Colm confirmed using tcpdump traces that the "missing" response packets were indeed getting sent with bad checksums. ("tcpdump -vv -s 1500 ip6" is the magic invocation for the curious) joe