From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Haley Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4 Date: Tue, 01 Oct 2013 14:57:33 -0400 Message-ID: <524B1B1D.3050304@hp.com> References: <3244031.uQGDddGTLF@h2o.as.studentenwerk.mhn.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: Wolfgang Walter , netdev@vger.kernel.org Return-path: Received: from g1t0027.austin.hp.com ([15.216.28.34]:34783 "EHLO g1t0027.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751223Ab3JAS5g (ORCPT ); Tue, 1 Oct 2013 14:57:36 -0400 In-Reply-To: <3244031.uQGDddGTLF@h2o.as.studentenwerk.mhn.de> Sender: netdev-owner@vger.kernel.org List-ID: On 10/01/2013 12:39 PM, Wolfgang Walter wrote: > Hello, > > I tried to upgrade one of our routers to 3.10.13 from 3.4.63 and I see a > dramatic performance loss. I tried 3.11.2 and it is still there. > > *** Symptoms: > > All network traffic over the router become slow and sluggish. If one pings the > router there is a packet loss. After about 2 minutes the traffic completely > stalls for about 1 minute. Then it works again as in the beginning to then > stall again. And so on. > > This happens even with rather moderate traffic. While still routing the CPU > utilization is higher than it is with 3.4.63 but only moderately. > > When it stalls no network traffic seems possible (but to loopback). If one > tries to ping from the router any target (even if it is on a interface with no > traffic at all) one gets: > > ping: sendmsg: No buffer space available dmesg show anything? I've seen this happen when the neighbour table is full, but that's not a typical occurence. -Brian