Re: FreeBSD 10.1-REL - network unaccessible after high traffic

Thanks, will try that!

2015.05.25. 9:25 keltezéssel, Julian Elischer írta:
> On 5/25/15 2:54 PM, Cs wrote:
>> Hi All,
>>
>> Julian gave me an idea to increase MTU to 9000 but I'm not sure if it 
>> helps. Anyway I increased it on both servers.
>> @Julian: the loader.conf and sysctl tuning parameters are ok?
>
> better mailing list might be -net.
>
> I don't see any obvious problems.
>  It may be worth trying to  turn off all the advanced features like 
> TSO etc.
>
>
>>
>> Regards,
>> Csaba
>>
>> 2015.05.25. 8:34 keltezéssel, Cs írta:
>>> 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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>>>>> "[email protected]"
>>>>>
>>>>
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>>
>

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