Hi Julian,
Yes, the problem was the same when I used cross link for two years.
The duplex settings are identical on both servers.
Server A:
em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
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 1500
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
I always suspected the 'em' driver and thought "it will be fixed in the
next release", but after ~3 years I think I need to dig deep to find the
root cause.
Regards,
Csaba
2015.05.25. 4:30 keltezéssel, Julian Elischer írta:
On 5/24/15 11:12 PM, 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. 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.
did you have the problem with no switch?
is he duplex setting correct?
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"
Any ideas? Thanks guys!
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