From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: data received but not detected Date: Fri, 20 Jun 2008 21:25:14 +0400 Message-ID: <20080620172513.GA16673@2ka.mipt.ru> References: <1213740538.5771.192.camel@localhost.localdomain> <48583B37.5070708@candelatech.com> <1213743506.5771.220.camel@localhost.localdomain> <20080618062857.GA3598@2ka.mipt.ru> <1213917029.9245.86.camel@localhost.localdomain> <20080620060219.GA22784@2ka.mipt.ru> <1213981859.9245.133.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Travis Stratman Return-path: Received: from relay.2ka.mipt.ru ([194.85.82.65]:45921 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752408AbYFTRZL (ORCPT ); Fri, 20 Jun 2008 13:25:11 -0400 Content-Disposition: inline In-Reply-To: <1213981859.9245.133.camel@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, Jun 20, 2008 at 12:10:59PM -0500, Travis Stratman (tstratman@emacinc.com) wrote: > Initially the application was just using a blocking recvfrom() call. I > changed to poll() and non-blocking recvfrom (MSG_DONTWAIT) today, and > poll() always times out when the lockup occurs. I also tried using an Can you confirm that IPSTATS_MIB_INRECEIVES MIB does not increase when packets are sent to the frozen machine, but userspace does not receive it? Please also clarify this bit again: you see packets in tcpdump running on receiving (frozen) host, but do not see them in userspace? After this freeze happend system recvmsg/poll calls do not respond until some activity on NIC happend? I.e. recv/poll 'unfreeze' only when something is received (arp, icmp reply) or after sending too? -- Evgeniy Polyakov