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SubjectRe: [regression][2.6.38-rcX][net][iwlagn] WiFi signal after period of time tanks causing contant drops
Date
Shawn Starr <shawn.starr <at> rogers.com> writes:

>
> On Thursday, February 10, 2011 10:07:48 PM Shawn Starr wrote:
> > On Thursday, February 10, 2011 07:16:24 AM wwguy wrote:
> > > On Wed, 2011-02-09 at 23:15 -0800, Andrew Morton wrote:
> > > > (cc linux-wireless)
> > > >
> > > > On Sun, 06 Feb 2011 22:54 -0500 Shawn Starr <shawn.starr <at> rogers.com>
> >
> > wrote:
> > > > > Using a Intel Corporation PRO/Wireless 5100 AGN [Shiloh] card
> > > > > after
> > > > > rebooting and a period of of seveal hours signal begins to drop
> > > > > to
> > > > > low levels:
> > > > >
> > > > >
> > > > > wlan0 IEEE 802.11abgn ESSID:"XXXXXXXX"
> > > > >
> > > > > Mode:Managed Frequency:2.462 GHz Access
> > > > > Point:
> > > > > AA:BB:CC:DD:EE:FF Bit Rate=11 Mb/s
> > > > > Tx-Power=15 dBm
> > > > > Retry long limit:7 RTS thr:off Fragment
> > > > > thr:off
> > > > > Power Management:off
> > > > > Link Quality=12/70 Signal level=-98 dBm
> > > > > Rx invalid nwid:0 Rx invalid crypt:0 Rx
> > > > > invalid frag:0
> > > > > Tx excessive retries:0 Invalid misc:35
> > > > > Missed
> > > > > beacon:0
> > > > >
> > > > > ...
> > > > >
> > > > > Link Quality=12/70 Signal level=-98 dBm
> > > > > Rx invalid nwid:0 Rx invalid crypt:0 Rx
> > > > > invalid frag:0
> > > > > Tx excessive retries:0 Invalid misc:40
> > > > > Missed
> > > > > beacon:0
> > > > >
> > > > > I start seeing lots of Invalid misc errors and connection drops.
> > > > > If
> > > > > I reboot, then signal will be back to normal for a period of
> > > > > time
> > > > > again.
> > > > >
> > > > > My official kernel is from Fedora rawhide
> > > > > (2.6.38-0.rc3.git4.1.fc15.x86_64)
> > > > >
> > > > > Anyone else notice poor link/signal levels?
> > > > >
> > > > > .37 showed no such issues.
> > >
> > > did not see anything special from the log, is any environment or
> > > condition changed? what AP you are using?
> > >
> > > Thanks
> > > Wey
> >
> > I'm using an Linksys WRT54G with tomato firmware for a number of years. The
> > AP is in my house and very close. I will keep an eye on this. This all
> > seemed to have started after we had a power outage. The AP is fine however
> > and I haven't noticed this drop a 2 after.
> >
> > If there was any environment changes they appear to have 'settled' down.
> >
> > I will be going to 2.6.38-0.rc4.git0.1.fc15 right now and will do another
> > long hour test by keeping the laptop on for a number of hours on the
> > weekend.
>
> To answer myself, https://bugzilla.kernel.org/show_bug.cgi?id=28832
>
> Looks like this is behavour observed in -rc3 the same period I did the
> upgrade. I can discount the power outage :)
>
> >
> > Thanks,
> > Shawn.
>


I'm seeing this too .. I have a lenovo laptop t420s .. I have great connection
for a period of time .. then all of a sudden my max download is 1Mb/sec .. I
have changed the MTU on the wlan0 and ppp0 [i'm also using vpn] to 1300 but the
problem eventually reappears. I'm using linksys wrt54gl . The connection is
solid. If i disconnect my wireless connection and then re connect then
everythign is fast again..

Linux localhost.localdomain 2.6.41.4-1.fc15.i686.PAE #1 SMP Tue Nov 29 11:47:02
UTC 2011 i686 i686 i386 GNU/Linux


BEFORE

lo no wireless extensions.

em1 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:"linksys"
Mode:Managed Frequency:2.437 GHz Access Point: 58:6D:8F:92:A9:5E
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=60/70 Signal level=-50 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:193 Missed beacon:0
AFTER

wlan0 IEEE 802.11bgn ESSID:"linksys"
Mode:Managed Frequency:2.437 GHz Access Point: 58:6D:8F:92:A9:5E
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=62/70 Signal level=-48 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:42692 Missed beacon:0







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