From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Subject: Re: tcp heisenbug Date: Fri, 8 Oct 2004 12:25:48 -0700 Sender: netdev-bounce@oss.sgi.com Message-ID: <20041008122548.544a3329.davem@davemloft.net> References: <20041008014151.26e17547.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@oss.sgi.com Return-path: To: Andrew Morton In-Reply-To: <20041008014151.26e17547.akpm@osdl.org> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Fri, 8 Oct 2004 01:41:51 -0700 Andrew Morton wrote: > fetchmail broke. It's fetching mail from localhost (ssh port-forwarded to > remote servers) and then for some reason it wants to open an SMTP > connection to localhost. It was failing, some error message about that > SMTP connection. > > While I was poking at it, it started to work. `uptime' said 6 minutes. So > I'd be suspecting that there's a jiffy wrap bug in TCP-to-localhost > introduced since 2.6.9-rc3. That's possible. It could also be something that only happens the first time you try to talk to a remote system. You're using e1000 on x86 right? Maybe force TSO off via ethtool right after the interface is brought up and see if that makes it go away?