linux-kernel - Re: 2.6.25-rc2 regression in rt61pci wireless driver

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Message-ID: <a32f33a40802251409ofbdab60w4a95c8aaefaad70a@mail.gmail.com>
Date:	Mon, 25 Feb 2008 23:09:39 +0100
From:	"Ivo Van Doorn" <ivdoorn@...il.com>
To:	chris2553@...glemail.com
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: 2.6.25-rc2 regression in rt61pci wireless driver

Hi,

>  > > >  Checking those out is simply a matter of:
>  > > >  git branch 2.0.11 2d68de3efa62655d551092f5c787505735d561ad
>  > > >  git checkout 2.0.11
>  > >
>  > > OK, we seem to be struggling a little, so I've built an installed git
>  > > and cloned Linus' 2.6 tree. My wireless network dies after a few pings
>  > > with rt2x00 2.0.11.
>  > >
>  > > >  No further bisecting is needed, but with above tests I can at least
>  > > >  narrow it down to find the cause of this issue.
>  > >
>  > > If you need me to bisect, just shout. Please be patient though, I'm
>  > > exploring new territory here :-)
>  >
>  > I don't think bisecting this will help a lot, the rt2x00 2.0.11 release
>  > introduced software diversity. And that is already something I suspect
>  > of being broken.
>  >
>   I've bisected anyway and although the results are not absolutely conclusive,
>  as I neared the end of the process, I was amongst a bunch of mac80211
>  patches. This set me on a path that resulted in me discovering that with the
>  rt61pci driver, I can freeze my wireless network connection almost at will if
>  I set mac82011's ieee80211_default_rc_algo parameter to 'pid'. if the
>  parametre is set to 'simple', the network seems to be reliable. I've just let
>  the ping application run on and ping another box on my network almost 1500
>  times whilst repeatedly transferring a kernel source tarball by ftp from
>  another box and the network connection was mantained That's with the
>  parameter set to 'simple', if \I set it to 'pid' the connection rarely
>  survives more than 40 pings even without the ftp activity.
>
>  If I replace my wireless card with one that uses the rtl8180 driver, the
>  network connection seems to be reliable regardless of how I set the
>  parameter, although I admit that i have not tested this extensively yet. I'll
>  do that now and report later.

I'm about to send 4 patches to this (linux-wireless) list with patches
for rt2x00,
most of them you already tested individually, but several people reported
success after those patches.

Hopefully it will be working for you as well. :)

Ivo
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