em interface slow down on 8.0R

[Lars Eggert]

Hi,

have you tried turning off TCP Segmentation Offloading (net.inet.tcp.tso sysctl)? That fixed performance issues with some em cards for me.

Lars

On 2010-1-25, at 5:47, Nick Rogers wrote:

> I am having similar em interface problems with some of my production
> machines running older intel 2-port cards, since upgrading from 7.2-RELEASE
> to 8.0-RELEASE. The problem is basically, everything works fine, but
> periodically the interface "hangs" (tcpdump shows no frames). A reboot or an
> ifconfig down followed by an ifconfig up fixes the problem for some time.
> Traffic peaks at maybe 20mbit per day and its all 802.1Q VLAN tagged traffic
> (about 10 vlan interfaces). When this happens netstat reports only errors
> and no packets on the affected interface. Media is set to autoselect. This
> is happening about 5-10x per day.
> 
> Heres relevant sysctl and ifconfig info.
> 
> dev.em.6.%desc: Intel(R) PRO/1000 Network Connection 6.9.14
> dev.em.6.%driver: em
> dev.em.6.%location: slot=3 function=0
> dev.em.6.%pnpinfo: vendor=0x8086 device=0x1079 subvendor=0x8086
> subdevice=0x1179 class=0x020000
> dev.em.6.%parent: pci3
> dev.em.6.debug: -1
> dev.em.6.stats: -1
> dev.em.6.rx_int_delay: 0
> dev.em.6.tx_int_delay: 66
> dev.em.6.rx_abs_int_delay: 66
> dev.em.6.tx_abs_int_delay: 66
> dev.em.6.rx_processing_limit: 100
> 
> em6: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
> ether 00:04:23:cd:47:82
> media: Ethernet autoselect (1000baseT <full-duplex>)
> status: active
> 
> On Tue, Jan 5, 2010 at 6:35 PM, Jason Chambers <jchambers at ucla.edu> wrote:
> 
>> Hiroki Sato wrote:
>>> Thank you!  I have investigated some more details.  First, I got
>>> something wrong with the affected FreeBSD versions; one I tried was
>>> 8.0-STABLE, not 8.0-RELEASE.  So I started to try 8.0R.  A summary of
>>> chips and releases I tried so far is now the following:
>>> 
>>>                                      7.2R  8.0R  8.0-STABLE
>>> 82540EM (chip=0x100e8086, rev=0x02)  OK    OK    too slow[1]
>>> 82541PI (chip=0x107c8086, rev=0x05)  OK    ?     OK
>> 
>> 
>> Running 8.0R I've noticed the same problem with this card (0x107c8086).
>>      Duplex and speed are manually set at full/1000.
>> 
>> 
>> em0 at pci0:3:3:0: class=0x020000 card=0x13768086 chip=0x107c8086 rev=0x05
>> hdr=0x00
>>   vendor     = 'Intel Corporation'
>>   device     = 'Gigabit Ethernet Controller (Copper) rev 5 (82541PI)'
>>   class      = network
>>   subclass   = ethernet
>> 
>> 
>> Regards,
>> 
>> --Jason
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