Volker wrote:
On 37378-12-23 20:59, Patrick M. Hausen wrote:
Hello!
Well, the best I can say at the moment is, "Wow." =-( I guess the
thing to do here is to figure out if the problem lies with the em
interrupt handler not getting run, or the taskqueue not getting run.
I helped Pyun with some debugging by providing ssh access to
a machine showing the (seemingly) same problem.
At first he thought the interrupt handler of the em driver was
the culprit, but we applied quite a few patches and tested
afterwards - seems like the driver is not the cause.
On -stable occasionally other people complained about very similar
looking problems with bge and other drivers. My guess is, though
I'm not a kernel developer, just an experienced admin, that
em stands out as problematic just by coincidence. Certain onboard
network components tend to come with certaiin chipsets and certain
architectures.
So, Pyun suggested it was a problem with the taskqueue that was
introduced some time between 6.0 and 6.1.
With my system (Tyan GT20 B5161G20) the problem shows when there
is heavy disk and cpu activity, like "make buildworld".
I made sure that the em interface doesn't share an interrupt
with the SATA controller. When the problem occurs, I get the
well known "watchdog timeout" messages and then the system's
network activity over that interface freezes completely for
a couple of minutes.
Usually the system recovers after a while without reboot or
other measures.
Strange... I've seen exactly that on a (recent) RELENG_6 box but
using a dirty old USB 1.1 NIC (aue). I've seen DOWN and UP messages
(mostly while rebuilding kernel + world + ports) on the console all
the time (but did not care about).
The machine in question is an Athlon XP-64 Socket 939, Asus A8N-VM
CSM. The USB ethernet NIC is a low budget ADMtek device. My
observations are probably not related to your issues but maybe a
sign of not really being a driver issue or not GigE related.
Greeting,
Volker
As soon as I can locate the O/U/EHCI register docs, I'll crank out a
patch for everyone to try. If that works then I'll give the same
treatment to ichsmb.
Scott
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