[ath9k-devel] Througput 802.11g-like - configuration issue?

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Thu, May 07, 2009 at 01:35:33PM -0700, austinxxh-ath9k at yahoo.com wrote:
> Luis,
> 
> from http://linuxwireless.org/en/users/Drivers/ath9k it states IBSS mode is supported.
> 
> Are you saying ath9k/11n will not support mesh/IBSS anytime in the future? I'm a bit confused by the message below.

Let me try to put this into a few sets of logical components, might
be easier to understand:

  * ath9k supports Ad-hoc (since 2.6.27) and Mesh (since 2.6.31 IIRC)
  * To use 802.11n completely you need to support MCS rates and aggregation
  * There are two types of 802.11n aggregation: AMPDU, AMSDU
  * mac80211 only supports AMPDU aggregation, there is some support for AMDSU 
    aggregation but for RX only and I am not sure if this was ever tested
  * 802.11 standards do not yet define how to support aggregation with ad-hoc
    or mesh
  * mac80211 does not support aggregation for Ad-hoc or Mesh, it just won't
    happen
  * You can probably use MCS rates with ath9k in both ad-hoc and in mesh mode
    but that's just by chance -- in the future we could decide just disable that.

For more details on 802.11n please see:

http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n

  Luis

> 
> thanks!
> xiao
> 
> 
> --- On Mon, 4/27/09, Luis R. Rodriguez <lrodriguez@atheros.com> wrote:
> From: Luis R. Rodriguez <lrodriguez@atheros.com>
> Subject: Re: [ath9k-devel] Througput 802.11g-like - configuration issue?
> To: "Fabian Hugelshofer" <hugelshofer2006@gmx.ch>
> Cc: "Johannes Berg" <johannes@sipsolutions.net>, "ath9k-devel at lists.ath9k.org" <ath9k-devel@lists.ath9k.org>
> Date: Monday, April 27, 2009, 12:38 PM
> 
> 
> On Mon, Apr 20, 2009 at 08:34:08AM -0700, Fabian
>  Hugelshofer wrote:
> > Hi all,
> >
> > I am using ath9k with OpenWRT. I have two router boards with identical
> > wireless cards. The wireless card get recognised as:
> > phy0: Atheros AR9160 MAC/BB Rev:1 AR5133 RF Rev:b0
> >
> > Both cards operate in ad-hoc mode on 2.4 or 5Ghz.
> 
> To use 11n fully (MCS rates and aggregation) you will need hostapd
> to use AP mode and a STA capable of using 11n. Ad-hoc mode does not
> define how to implement 11n support and as such we don't support it
> with mac80211. Right now in mac80211 we do allow you to set your
> channel type to an HT mode if on adhoc or Mesh but perhaps we'll
> disable this as its not supposed really supported.
> 
>   Luis
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>