em interface slow down on 8.0R
hrs at FreeBSD.org
Sat Dec 5 09:43:27 UTC 2009
Hiroki Sato <hrs at freebsd.org> wrote
in <20091203.182931.129751456.hrs at allbsd.org>:
hr> And another thing, I noticed a box with 82573E and 82573L sometimes
hr> got stuck after upgrading to 8.0-STABLE. It has moderate network
hr> load (average 5-10Mbps) on both NICs. It worked for a day or two and
hr> then got stuck suddenly. Rebooting the box solved the situation, but
hr> it got stuck again after a day or so. After it happens, the
hr> interface does not respond. The other functionalities of FreeBSD
hr> seemed working. Doing an up/down cycle for the NICs seemed to send
hr> some packets, but it did not recover completely; rebooting was needed
hr> for recovery. This box does not have the RTT problem. I am still
hr> not sure what is the trigger, there seems something wrong.
Things turned out for this symptom so far are:
- This occurs around once per 1-2 days.
- Once it occurs, all of communications including ARP and IPv4 stop.
- "ifconfig em0 down/up" can recover the interface. However, on doing
"up" after "down" the following message was displayed:
# ifconfig em0 up
em0: Could not setup receive structures
After trying it several times it worked.
Then, the interface seemed back to normal for a couple of minutes,
but it stopped again.
I guess there is a kind of deadlock somewhere but not sure it is
really related to the em(4) driver. I will continue to investigate
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