em interface slow down on 8.0R

[Nick Rogers]

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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