Red Hat Bugzilla – Bug 426051
NetworkManager wakes up every second even when there's no network
Last modified: 2009-10-12 09:08:14 EDT
While checking my system with powertop, I see NetworkManager waking up once per
second, even where there is no network (wired or wireless) connected (the
wireless is disabled with a switch). powertop says:
1.4% ( 1.0) NetworkManager : tg3_open (tg3_timer)
which I guess is NM looking for a wire in the network jack? If I plug in to the
wired network, NM still shows the same behavior.
Also, NM has wpa_supplicant running all the time (again, even when there's no
network connection at all), which is also waking up 1.5 times per second
(there's already a bug on that). Shouldn't wpa_supplicant only run when needed?
This is probably a duplicate of bug 221773, which has a patch available.
Bug 221773 is private. Can you either make it public or copy the relevant
information (such as if there is a patch why hasn't it been applied) and patch
here? That bug would be over a year old also, so I don't know if any included
patch would still apply to current NM.
Probably not a dupe of bug 221773 actually, since it's NetworkManager showing up
in powertop and not the applet.
What wireless hardware do you have? Can you run 'iwevent' and attach some logs
here? It might be that your wireless card (ipw2200 has this issue) is sending a
continuous stream of background scan results, which causes wpa_supplicant to
wake up, which then causes NM to wake up and process the results. Recent
kernels (2.6.23 and 2.6.24) have a patch to make ipw2200 driver quieter.
It is an ipw2200 (in a Thinkpad Z60m). Does it send scan results even when the
front cut-off switch is turned off? I am running 126.96.36.199-64.fc8, and with the
switch turned off, iwevent doesn't show anything happening, but I still see
NetworkManager waking up once per second. The wakeup is listed as "tg3_open
(tg3_timer)", so maybe it is related to the ethernet port instead; does NM have
to wake up to check for link up/down? I get the same behavior if the ethernet
is connected or not.
is this still an issue with the latest f8/f9 updates? Try with svn4022 or later please.
I still see this same issue with a Thinkpad Z60m
and I tested after a clean restart, with the latest Fedora 9 kernel.
I doubt this issue will magically go away, if it's not a NetworkManager problem it needs to be re-assigned to the owner of the tg3 (Broadcom Tigon3) driver.
I checked on an up-to-date rawhide system, and I'm still seeing NM wake up in powertop, even with no network connected (wired tg3 unplugged and wireless ipw2200 switched off)
7.1% ( 1.0) NetworkManager : __mod_timer (tg3_timer)
2.1% ( 0.3) NetworkManager : __mod_timer (process_timeout)
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Consider for example, my earlier suggestion that this bug might actually be caused by the Tigon3 ethernet driver. Investigate. Is that true? The Tigon3 driver was apparently partly written by a Red Hat employee. Maybe they can be CC'd into this bug to offer an opinion. What is tg3_timer?
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I am still seeing this with Fedora 11 on my Dell Latitude D620 when I have "Enable Networking" on and no ethernet cable connected. The result is the same whether or not I am on a wireless network. From the powertop output:
( 1.0) NetworkManager : __mod_timer (tg3_timer)
$ rpm -q NetworkManager
Someone please reopen this against Fedora 11.
check with my desktop (as in Comment #11) and the result is:
0,1% ( 0,1) NetworkManager : __mod_timer (nv_do_stats_poll)