Re: debugging lack of link events
- From: Dan Williams <dcbw redhat com>
- To: Derek Atkins <warlord MIT EDU>
- Cc: networkmanager-list gnome org
- Subject: Re: debugging lack of link events
- Date: Wed, 10 Aug 2005 13:01:01 -0400
On Wed, 2005-08-10 at 11:19 -0400, Derek Atkins wrote:
> Dan,
>
> Any suggestions for how to debug the fact that NM isn't receiving
> link-up/link-down events from my e1000 after suspend/resume? I really don't
> know enough of the udev/hal/dbus interaction to know where to start looking,
> nor do I understand the underlying protocols well enough to know how to insert
> myself and watch all the traffic...
>
> Any (1st grade, even) suggestions would be greatly appreciated. I find it quite
> hard to live with losing network after a suspend/resume.
Ok, my debugging with e1000 (2.6.12-1.1448_FC5) indicates that it only
notices carrier ON events after 25 - 30s, and carrier OFF events after
50s. This is, frankly, suboptimal.
If you want a really, really quick and dirty way to figure this out:
watch -n 1 "cat /sys/class/net/eth0/carrier"
And time it with a wall clock from when you plug the cable in to when
the output changes to a '1'. Same for unplug, look for '0'. I found
there isn't a difference between my netlink socket testcase and
monitoring the drivers's carrier file in sysfs (they both actually come
from the same place in the driver anyway).
Dan
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