Rate problems with iwl3945

Rate problems with iwl3945

[Jens Axboe]

Hi,

I wrote yesterday about my peering issues with this driver. After
getting the hint that iwlist scan would make it associate, I got that
working.

Copying some files I noticed it was slow, though. iwconfig reveals that
it's only running at 5.5Mb/s and indeed I only get around 650-700kb/sec
copying data. I tried to force it to 54M, but no matter what setting I
try with iwconfig rate, it stays at 5.5 and the performance stinks. With
ipw3945 I always got around ~3mb/s scp'ing data.

With the risk of sounding rude, is this driver expected to be of
production quality? It doesn't link, performance is bad. Am I better off
sticking to ipw3945 still? Are there patches out there I can try? Who
maintains this driver?

-- 
Jens Axboe

Re: Rate problems with iwl3945

[Johannes Berg]

[-- Attachment #1: Type: text/plain, Size: 447 bytes --]

Hi,

> Copying some files I noticed it was slow, though.

Can you check that the right mode is selected? There's a bugfix pending
for mac80211 that makes it select 802.11b mode rather than 802.11g. I
don't remember whether I've asked this already so if I did please accept
my apology. FWIW, the fix is by me (in all fairness, the regression was
also introduced by me) titled "[PATCH v2] mac80211: fix set_channel
regression"

johannes

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

Re: Rate problems with iwl3945

[Jens Axboe]

On Thu, Oct 18 2007, Johannes Berg wrote:
> Hi,
> 
> > Copying some files I noticed it was slow, though.
> 
> Can you check that the right mode is selected? There's a bugfix pending
> for mac80211 that makes it select 802.11b mode rather than 802.11g. I
> don't remember whether I've asked this already so if I did please accept
> my apology. FWIW, the fix is by me (in all fairness, the regression was
> also introduced by me) titled "[PATCH v2] mac80211: fix set_channel
> regression"

Indeed, it's running 802.11b. Even so, why is it switching down to 5.5M?
Link quality is around 96/100, I'm sitting about a meter away from the
AP right now.

So where do I find this fix?

-- 
Jens Axboe

Re: Rate problems with iwl3945

[Jens Axboe]

On Thu, Oct 18 2007, Jens Axboe wrote:
> On Thu, Oct 18 2007, Johannes Berg wrote:
> > Hi,
> > 
> > > Copying some files I noticed it was slow, though.
> > 
> > Can you check that the right mode is selected? There's a bugfix pending
> > for mac80211 that makes it select 802.11b mode rather than 802.11g. I
> > don't remember whether I've asked this already so if I did please accept
> > my apology. FWIW, the fix is by me (in all fairness, the regression was
> > also introduced by me) titled "[PATCH v2] mac80211: fix set_channel
> > regression"
> 
> Indeed, it's running 802.11b. Even so, why is it switching down to 5.5M?
> Link quality is around 96/100, I'm sitting about a meter away from the
> AP right now.
> 
> So where do I find this fix?

Ah found it, in the wireless git repo. Testing...

-- 
Jens Axboe

Re: Rate problems with iwl3945

[Jens Axboe]

On Thu, Oct 18 2007, Jens Axboe wrote:
> On Thu, Oct 18 2007, Jens Axboe wrote:
> > On Thu, Oct 18 2007, Johannes Berg wrote:
> > > Hi,
> > > 
> > > > Copying some files I noticed it was slow, though.
> > > 
> > > Can you check that the right mode is selected? There's a bugfix pending
> > > for mac80211 that makes it select 802.11b mode rather than 802.11g. I
> > > don't remember whether I've asked this already so if I did please accept
> > > my apology. FWIW, the fix is by me (in all fairness, the regression was
> > > also introduced by me) titled "[PATCH v2] mac80211: fix set_channel
> > > regression"
> > 
> > Indeed, it's running 802.11b. Even so, why is it switching down to 5.5M?
> > Link quality is around 96/100, I'm sitting about a meter away from the
> > AP right now.
> > 
> > So where do I find this fix?
> 
> Ah found it, in the wireless git repo. Testing...

That did the trick! It's now running 802.11g, rate 54 Mb/s. And
performance is back where it should be, similar to ipw3945.

Thanks a lot for the hint!

-- 
Jens Axboe