problems with network on em

Mike Tancsa mike at
Sat Nov 20 15:50:49 UTC 2010

On 11/20/2010 10:09 AM, rolnas at wrote:
> I'm experiencing network interface stalls on em in FreeBSD 8.1-RELEASE (-p1).
> It looks like the problem could be solved in 8-STABLE, but should I upgrade to it ?
> Is it OK to try to get only em driver code and recompile as module and try to run it ?
> sysctl dev.em.2.stats=1:
> ...
> em2: Missed Packets = 101334
> em2: Receive No Buffers = 488
> ...
> em2: RX overruns = 1356
> em2: watchdog timeouts = 1
> ...
> Only "ifconfig em2 down;ifconfig em2 up" helps for some time.
> The same happens on em0 interface only, but not in the same time.
> It is production (NAT) router with pf+pfsync+carp and failover over another router.
> They are old "SunFire X4100" boxes (4GB RAM, 2*2 AMD Opteron 2.2GHz).

There are a lot of bug fixes  in the version for HEAD.  I would actually
try that. You should be able to compile it in your existing kernel.
Just grab the source files from /usr/src/sys/dev/e1000 from CURRENT and
overwrite them locally. Then recompile your kernel and try that.


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