Date: Mon, 25 May 2015 11:12:35 +0200 From: Cs <bimmer@field.hu> To: Mark Schouten <mark@tuxis.nl> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD 10.1-REL - network unaccessible after high traffic Message-ID: <440563e0-ec18-4853-8952-866006d06141@typeapp.com> In-Reply-To: <13CD4CDB-1744-4E2F-8FD7-BFE2365121F3@tuxis.nl> References: <5562D0F3.4070408@field.hu> <13CD4CDB-1744-4E2F-8FD7-BFE2365121F3@tuxis.nl>
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It was on 1500 for ~3 years :) Regards, Csaba On May 25, 2015, 10:30, at 10:30, Mark Schouten <mark@tuxis.nl> 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" <bimmer@field.hu> 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<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu >9000 >> >options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO> > >> ether 00:25:90:24:52:66 >> inet x.x.x.x netmask 0xfffffe00 broadcast x.x.x.x >> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> >> media: Ethernet autoselect (1000baseT <full-duplex>) >> status: active >> >> Server B: >> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu >9000 >> >options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO> > >> ether 00:30:48:dd:fe:3e >> inet x.x.x.x netmask 0xfffffe00 broadcast x.x.x.x >> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> >> media: Ethernet autoselect (1000baseT <full-duplex>) >> 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"
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