Re: [Madwifi-users] NetGear WG511T works!

[Greg C. <ma...@at...>]

Super G consists of  several hw features which can be enabled separately 
or together:
    1. dynamic turbo (108 Mhz Phy),
    2. packet bursting ( sending several frames back-to-back),
    3. sending large packets (the hw can send/receive 3Kb frames),
    4. enabling hw packet compression.

The driver will let you operate in turbo mode now, although not the 
dynamic mode.
The difference is that in classic turbo mode, all the active stations 
and the AP have to agree
on turbo mode.   In dynamic turbo mode the AP listens for non-turbo 
stations and will limit
the real-time spent in turbo, including limiting it down to zero.   So, 
this is not difficult
to support in the client driver, but complex at the AP.

Packet bursting is easy and that's one of the performance things that 
we'll add to the driver soon.

Sending large frames is also easy.   I'd like to do it differently in 
Linux than it was
done for NDIS.   In the MS operating systems it is not possible to set 
the MTU on a network
to something like 4KB and have the OS give you 4K frames.   On Linux 
this is easy.
But it requires a handshake agreement between endpoints before entering 
this mode.

Compression is easy to enable, assuming that you also have the pairwise 
negoatiation in place.
But the driver needs to have some idea of when compression should be on 
or off.

Of all these techniques, packet bursting is the only one that should 
work with all APs.
The others require a SuperG AP or a Linux-based AP that can do the setup 
negotiation.

There are a few other hw features that we plan to get in the driver 
before going for SuperG.
The main one for me is to turn on the improved transmission retry 
algorithms.
That should boost performance for noisy connections that would otherwise 
be relying
on TCP retransmission.    Needs tuning and experimentation, but is a 
good thing.

I've been usiing monitor mode on Linux with ethereal and see some odd 
behaviors
that I'd like to fix.   So, that's another one.

Recent madwifi releases have incorporated some improvements that deal 
with high phy rate
errors and noisy channels.   But that work is not really done.   Now 
that we have the driver
working for the current available retail products, we want to revisit 
some of these robustness
issues.

We need to make some progress integrating 802.1X and WPA.

Not the least of the issues are anomalies with wlan.o.   Everybody has 
their own opinions
on that.   My own list includes things like getting the thing to camp on 
a channel
or channel list that I select while restricting channel scanning to just 
that list.
There's more, but you get the idea.   There's plenty of work to do.

g

Imre Kaloz wrote:

>Yaahoo here too :)
>
>I confirm that too, the WG511T works.. The HAL has been updated, as I see.
>Sam, does it support Super-G mode, too?
>
>Thanks,
>Imre
>
>
>On Sun, 7 Dec 2003, Stefan Naewe wrote:
>
>  
>
>>-----BEGIN PGP SIGNED MESSAGE-----
>>Hash: SHA1
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>>Yaahoo!
>>
>>I 'cvs up'ed today and guess what ? The ath_pci.o loads without any problem!
>>Whoever did the necessary changes (Sam ?): Thank you a lot!
>>
>>Thank you guys
>>
>>Stefan
>>- --
>>- -----------------------------------------------------------------
>>Stefan Naewe (st...@na...)             GNU/Linux User #165035
>>PGP-Key: 2E77 7C17 9606 E5C5 20F5  5F6D C560 CAF1 08A3 41FF
>>
>>It's most certainly GNU/Linux, not Linux. Read more at
>>http://www.gnu.org/gnu/why-gnu-linux.html.
>>- -----------------------------------------------------------------
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>>ES+InD5G2ZXW7wofhS+c6+o=
>>=uOsK
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>>
>>
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