freebsd stable - Jan 2011 - Regression with iwn drivers (4965BGN) in 8.2-PRERELEASE ?

Hi all,
Since I've upgraded from 8.1 to 8.2RC, my wireless negotiated speed is
very very slow (more exactly it start at normal speed, but decrease
each second still stopping a 1Mbps and became unusuable).

I'm using iwn drivers:
iwn0: <Intel(R) PRO/Wireless 4965BGN> mem 0xf6cfe000-0xf6cfffff irq 17
at device 0.0 on pci12
iwn0: MIMO 2T3R, MoW2, address 00:1d:e0:72:10:01
iwn0: [ITHREAD]
iwn0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
iwn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps
24Mbps 36Mbps 48Mbps 54Mbps

[root@d630]~#uname -a
FreeBSD d630.bsdrp.net 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #1: Sun
Jan  2 01:32:14 CET 2011
root@d630.bsdrp.net:/usr/obj/usr/src/sys/GENERIC  amd64

Does anybody else meet the same problem ?

Thanks,

Olivier

On Thursday, January 06, 2011 10:02:54 Olivier Cochard-Labb?
wrote:
> Hi all,
> Since I've upgraded from 8.1 to 8.2RC, my wireless negotiated speed is
> very very slow (more exactly it start at normal speed, but decrease
> each second still stopping a 1Mbps and became unusuable).
> 
> I'm using iwn drivers:
> iwn0: <Intel(R) PRO/Wireless 4965BGN> mem 0xf6cfe000-0xf6cfffff irq
17
> at device 0.0 on pci12
> iwn0: MIMO 2T3R, MoW2, address 00:1d:e0:72:10:01
> iwn0: [ITHREAD]
> iwn0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
> iwn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
> iwn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps
> 24Mbps 36Mbps 48Mbps 54Mbps
> 
> [root@d630]~#uname -a
> FreeBSD d630.bsdrp.net 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #1: Sun
> Jan  2 01:32:14 CET 2011
> root@d630.bsdrp.net:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> Does anybody else meet the same problem ?
Haven't seen this yet.

What do you mean with 'unusable' exactly? Lots of packet loss, or just
slow
transfer rates? 'wlandebug +rate' might shed some light on this one.

-- 
Bernhard