From owner-freebsd-net@FreeBSD.ORG Tue May 26 08:36:46 2015 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 921DEEA5 for ; Tue, 26 May 2015 08:36:46 +0000 (UTC) (envelope-from bimmer@field.hu) Received: from green.field.hu (green.field.hu [217.20.130.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 1C65D20D for ; Tue, 26 May 2015 08:36:46 +0000 (UTC) (envelope-from bimmer@field.hu) Received: from green.field.hu (localhost [127.0.0.1]) by green.field.hu (Postfix) with ESMTP id EFA63250A99 for ; Tue, 26 May 2015 10:36:36 +0200 (CEST) X-Virus-Scanned: by Amavisd-new at field.hu Received: from green.field.hu ([127.0.0.1]) by green.field.hu (green.field.hu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2gwVk8F_SAyk for ; Tue, 26 May 2015 10:36:33 +0200 (CEST) Received: from [10.10.10.139] (unknown [188.227.229.50]) by green.field.hu (Postfix) with ESMTPA id 250E4250A64 for ; Tue, 26 May 2015 10:36:33 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=field.hu; s=mail; t=1432629393; bh=ppDKh3W3KKaA0mpZIcKDnd1p7Ur2ho8rDkjljTfZfJo=; h=Date:From:To:Subject:References:In-Reply-To; b=DQ2PmM5Uf4QKPH6WxecfU/jKVuHaSgPuD3XYZC6XEvmFv++5sCwJuGGAab/vBF0sV dKd0HzEfRlPkPIyB6zIogFpQ7bhEaE9XtSJLG+1NGiNLq0TPkEaq8woTmHfwQg1l0f dKD3+WjXp/qHlmljV4Wr9iPPCM+i/+oiSNP3sCb4= Message-ID: <5564308A.7010502@field.hu> Date: Tue, 26 May 2015 10:36:26 +0200 From: Cs User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: freebsd-net@freebsd.org Subject: Re: FreeBSD 10.1-REL - network unaccessible after high traffic References: <2404899099-25362@alcyone.saas.tuxis.net> In-Reply-To: <2404899099-25362@alcyone.saas.tuxis.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2015 08:36:46 -0000 Thanks Mark, good idea. I found this thread which is exactly the same problem as mine: https://forums.freebsd.org/threads/workaround-freebsd-10-1-sudden-network-down.49264/ Will see if it helps in a couple weeks. Regards, Csaba 2015.05.26. 10:30 keltezéssel, Mark Schouten írta: > Oh, didn't see your lowest remark. Then, the next thing that comes past here a few times per week is 'Try disabling TSO'. > > > Met vriendelijke groeten, > > -- > Kerio Operator in de Cloud? https://www.kerioindecloud.nl/ > Mark Schouten | Tuxis Internet Engineering > KvK: 61527076 | http://www.tuxis.nl/ > T: 0318 200208 | info@tuxis.nl > > > > Van: Cs > Aan: Mark Schouten > Cc: > Verzonden: 25-5-2015 11:12 > Onderwerp: Re: FreeBSD 10.1-REL - network unaccessible after high traffic > > It was on 1500 for ~3 years :) > > Regards, > Csaba > > > > On May 25, 2015, 10:30, at 10:30, Mark Schouten wrote: >> Try lowering your mtu to 1500, that worked miracles for me.. >> >> -- >> Mark Schouten >> Tuxis Internet Engineering >> mark@tuxis.nl / 0318 200208 >> >>> On 25 May 2015, at 09:36, "Cs" wrote: >>> >>> Hi all, >>> >>> I have two FreeBSd 10.1-RELEASE servers connected to each other. They >> were connected via cross link, but they are connected to a cisco switch >> now (the problem was the same with cross link too). When transferring >> huge files (50-500GB backup files) via Gigabit (it is important!) the >> network randomly dies. The backup runs every day/week and sometimes the >> connection is ok for months sometimes it happens twice a week. When the >> network dies I can log in to the server via IPMI and use the console >> everything is OK, but can't send anything out on the network. ifconfig >> em0 down/up doesn't help nor netif restart. The problem never occured >> when I used 100Mbit connection between them, but it was 3com NIC (xl), >> gigabit adapter is Intel (em0). When I limit the transfer rate (rsync >> bandwith limit or ipfw pipe) the problem is much more rare. >>> >>> I tried to set these tuning parameters on both servers with different >> buffer size but nothing helped: >>> >>> # cat /etc/sysctl.conf >>> security.bsd.see_other_uids=0 >>> net.inet.tcp.recvspace=512000 >>> net.route.netisr_maxqlen=2048 >>> kern.ipc.nmbclusters=1310720 >>> net.inet.tcp.sendbuf_max=16777216 >>> net.inet.tcp.recvbuf_max=16777216 >>> kern.ipc.soacceptqueue=32768 >>> >>> # cat /boot/loader.conf >>> geom_mirror_load="YES" # RAID1 disk driver (see gmirror(8)) >>> ipfw_load="YES" >>> net.inet.ip.fw.default_to_accept=1 >>> kern.maxusers=4096 >>> accf_data_load="YES" >>> >>> The duplex settings are identical on both servers. >>> >>> Server A: >>> em1: flags=8843 metric 0 mtu >> 9000 >> options=4219b >> >>> ether 00:25:90:24:52:66 >>> inet x.x.x.x netmask 0xfffffe00 broadcast x.x.x.x >>> nd6 options=29 >>> media: Ethernet autoselect (1000baseT ) >>> status: active >>> >>> Server B: >>> em0: flags=8843 metric 0 mtu >> 9000 >> options=4219b >> >>> ether 00:30:48:dd:fe:3e >>> inet x.x.x.x netmask 0xfffffe00 broadcast x.x.x.x >>> nd6 options=29 >>> media: Ethernet autoselect (1000baseT ) >>> status: active >>> >>> Today I tried to set mtu to 9000 but in tcpdump I see that during scp >> it is still 1500: >>> x.x.x.x.222 > x.x.x.x.37612: Flags [.], cksum 0xb6ee (incorrect -> >> 0xda6f), seq 35749, ack 113701596, win 7986, options [nop,nop,TS val >> 3103966325 ecr 853712893], length 0 >>> 09:27:33.912354 IP (tos 0x8, ttl 64, id 1028, offset 0, flags [DF], >> proto TCP (6), length 1500) >>> 09:27:33.912358 IP (tos 0x8, ttl 64, id 1029, offset 0, flags [DF], >> proto TCP (6), length 1500) >>> >>> >>> Any ideas? Thanks guys! >>> _______________________________________________ >>> freebsd-net@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>> To unsubscribe, send any mail to >> "freebsd-net-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > >