On Mon, 2006-07-03 at 18:46 -0400, Darren Albers wrote: > On 7/3/06, Robert G. Brown <[EMAIL PROTECTED]> wrote: > > > > I run a set of system monitor panels at the top of my screen that > > includes the network. I noticed that my network load (which was zero a > > lot of the time before as I work on local files etc) starts off at zero > > but then creeps up over time to end up in a range anywhere from 4% to > > 100%, sustained, when I'm not typing and nothing at all is happening on > > the system. This is enough that the system load average sometimes bumps > > up to a few percent when nothing is happening, and the system fan kicks > > on as heat is generated from the load. > > > > I used tcpdump/top to try to figure out just what was happening. top is > > unremarkable -- hald accumulates a bit of time, NM accumulates a minute > > or so a day, X of course accumlates time, but nothing looks like it is > > running away or unreasonable. > > > > tcpdump is interesting, though. I see a steady stream of packets like > > the one below -- typically 3-5 almost-full-MTU frames/sec. Note that > > they are "from" the router and "to" the wireless interface on my laptop. > > Note also that they are completely empty past the ethernet header itself > > (or if there ever was data, it was stripped off upstream by the wireless > > interface). > > I'm wondering if this is an artifact of netgear's implementation of MIMO > > -- perhaps what is making it through to the OS from a "sounding frame". > > In order to tune the multiple antennae dynamically, tuning frames are > > (supposedly) periodically sent with some complex encoded information. > > It MAY be that these frames are supposed to be isolated by the wireless > > client device and not passed back to the recipient network interface -- > > if you have a MIMO compliant device receiving, which is of course pretty > > much impossible at this point. Perhaps the radio pulls off the tuning > > information correctly but is still forwarding the packet headers and an > > empty frame to the bus, I don't know. Does anybody on this list know > > what's going on ? Is this perhaps an artifact instead of a NM feature, > > perhaps in response to these odd no-protocol packets? Is there any way > > to shut them off or regulate them to drop the network "load" back down > > to sane idle levels? > > I would connect to your AP by stopping NM and starting WPA_Supplicant > manually and see if you observe the same behavior. I haven't
Probably a good idea. > witnessed what you are describing personally but I wonder if what you > are seeing is just noise caused by the MIMO router hopping channels... > _______________________________________________ > NetworkManager-list mailing list > [email protected] > http://mail.gnome.org/mailman/listinfo/networkmanager-list _______________________________________________ NetworkManager-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/networkmanager-list
