From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?UGF3ZcWCIFN0YXN6ZXdza2k=?= Subject: Re: Problem wit route cache Date: Mon, 08 Feb 2010 14:59:59 +0100 Message-ID: <4B7018DF.8060600@itcare.pl> References: <4B700EC2.5090207@itcare.pl> <1265635690.3048.8.camel@edumazet-laptop> <4B7012BC.9000702@itcare.pl> <1265637067.3048.14.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE To: Eric Dumazet , Linux Network Development list Return-path: Received: from r242-20.iq.pl ([86.111.242.20]:43626 "EHLO smtp.iq.pl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752202Ab0BHN77 (ORCPT ); Mon, 8 Feb 2010 08:59:59 -0500 In-Reply-To: <1265637067.3048.14.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: W dniu 2010-02-08 14:51, Eric Dumazet pisze: > Le lundi 08 f=C3=A9vrier 2010 =C3=A0 14:33 +0100, Pawe=C5=82 Staszews= ki a =C3=A9crit : > > =20 >>> >>> =20 >> Yes this is x86_64 kernel >> i kernels 2.6.32.2 / 2.6.32.7 and now 2.6.33-rc6-git5 and on all >> kernels the same thing happens. >> grep . /proc/sys/net/ipv4/route/* >> /proc/sys/net/ipv4/route/error_burst:1250 >> /proc/sys/net/ipv4/route/error_cost:250 >> grep: /proc/sys/net/ipv4/route/flush: Permission denied >> /proc/sys/net/ipv4/route/gc_elasticity:2 >> /proc/sys/net/ipv4/route/gc_interval:2 >> /proc/sys/net/ipv4/route/gc_min_interval:0 >> /proc/sys/net/ipv4/route/gc_min_interval_ms:500 >> /proc/sys/net/ipv4/route/gc_thresh:65535 >> /proc/sys/net/ipv4/route/gc_timeout:300 >> /proc/sys/net/ipv4/route/max_size:524288 >> /proc/sys/net/ipv4/route/min_adv_mss:256 >> /proc/sys/net/ipv4/route/min_pmtu:552 >> /proc/sys/net/ipv4/route/mtu_expires:600 >> /proc/sys/net/ipv4/route/redirect_load:5 >> /proc/sys/net/ipv4/route/redirect_number:9 >> /proc/sys/net/ipv4/route/redirect_silence:5120 >> /proc/sys/net/ipv4/route/secret_interval:2 >> >> This happens not all the time. >> I have this info only when there are "internet rush hours" - thn the= re >> is about 700Mbit/s TX + 700Mbit/s RX forwarded traffic >> >> =20 > I dont understand your settings, they are very very small for your > setup. You want to flush cache every 2 seconds... > > With 12GB of ram, you could have > > /proc/sys/net/ipv4/route/gc_thresh:524288 > /proc/sys/net/ipv4/route/max_size:8388608 > /proc/sys/net/ipv4/route/secret_interval:3600 > /proc/sys/net/ipv4/route/gc_elasticity:4 > /proc/sys/net/ipv4/route/gc_interval:1 > > That would allow about 2 million entries in your route cache, using 7= 68 > Mbytes of ram, and a good cache hit ratio. > > > =20 Yes as i write i change this settings after i see first info=20 "secret_interval" - from 3600 to 2 To check if this resolve the problem. Also my normal settings are: /proc/sys/net/ipv4/route/gc_thresh:256000 /proc/sys/net/ipv4/route/max_size:1048576 /proc/sys/net/ipv4/route/secret_interval:3600 /proc/sys/net/ipv4/route/gc_interval:2 /proc/sys/net/ipv4/route/gc_elasticity:2 And with this setting i was have this info: Route hash chain too long! Adjust your secret_interval! Now i put Your settings as You suggest ... and we will see but i dont k= now it will help. Because i try many of different settings. > > > > > =20