From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: TCP stalls in current git, possibly splice related Date: Wed, 18 Jul 2007 12:49:16 +0200 Message-ID: <20070718104916.GJ11657@kernel.dk> References: <1184320965.30334.2.camel@johannes.berg> <20070713110534.GF5328@kernel.dk> <1184575545.15112.0.camel@johannes.berg> <20070716120247.GG5195@kernel.dk> <1184711770.4658.5.camel@johannes.berg> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: James Morris , "David S. Miller" , netdev@vger.kernel.org To: Johannes Berg Return-path: Received: from brick.kernel.dk ([80.160.20.94]:29501 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753334AbXGRKtn (ORCPT ); Wed, 18 Jul 2007 06:49:43 -0400 Content-Disposition: inline In-Reply-To: <1184711770.4658.5.camel@johannes.berg> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Wed, Jul 18 2007, Johannes Berg wrote: > On Mon, 2007-07-16 at 14:02 +0200, Jens Axboe wrote: > > > Yep, it's a sender thing, so upgrading the receiver will not change > > anything. > > Ok, I upgraded, but that didn't help. And in fact, I don't see how it > could have since synergy doesn't use splice or sendfile. I should've > thought of that right away, sorry. > > It seems that packets are actually coming in during the time that my > mouse hangs though (ran wireshark in parallel and saw no pauses in the > timeline.) Hence, it actually seems to be on the receiver side, and > running the synergy client under strace reveals that during the time my > mouse hangs it's in poll() waiting for input on the tcp socket. sysrg-t > doesn't show anything useful, it's just scheduling waiting for data. > According to wireshark data is sent, but it never shows up at the > application layer. OK, then we can put splice off the hook at least :-) If it's easily reproducible (and it sounds like it), then a git bisect might be the easiest way forward. -- Jens Axboe