From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nivedita Singhvi Subject: Re: Dump of TCP hang in established state Date: Wed, 21 May 2003 10:19:30 -0700 Sender: netdev-bounce@oss.sgi.com Message-ID: <3ECBB522.9080101@us.ibm.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: Martin Josefsson , netdev@oss.sgi.com Return-path: To: James Morris In-Reply-To: Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org James Morris wrote: >>- There are those mysterious TCP hangs of established state sockets. >> Someone has to get a good log in order for us to effectively debug this. >> >>I think this is what I've seen a few times when using distcc. > > Does anyone know if the other hangs are seen when the app is using > TCP_CORK (like distcc does) ? We had observed some hangs during SpecWeb99 benchmark runs. Unfortunately, we managed to burn down the machine and have yet to rerun the benchmark. No other workload seems to be observing them. I'm trying to excavate the one incomplete trace I had of that hang, if possible. IIRC it was using sendfile(), so probably also using TCP_CORK, though dont know that for sure. Can anyone tell me what to do to reproduce this? Also, I'd like to have this tracked in bugzilla, if noone objects (DaveM?), so we dont lose it..I had dropped some earlier reports of hangs. I'll file in BUGME.. thanks, Nivedita