Try lowering your mtu to 1500, that worked miracles for me.. -- Mark Schouten Tuxis Internet Engineering m...@tuxis.nl / 0318 200208
> On 25 May 2015, at 09:36, "Cs" <bim...@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-unsubscr...@freebsd.org" _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
