linux-kernel - Re: [mac80211 ] Wifi Network slownes bisected

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Date:	Thu, 21 May 2009 18:08:11 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Alejandro Riveira Fernández 
	<ariveira@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [mac80211 ] Wifi Network slownes bisected

On Thu, 2009-05-21 at 17:38 +0200, Alejandro Riveira Fernández wrote:

>  I noticed that my wifi connection has slowed when stitching
> from 2.6.29.1 to 2.6.29.4 (it is also slow on 30-rc6)
> Also 2.6.27 (ubuntu) does not suffer it.

> $ git bisect good
> 64e1b00c974ddeae6a60ebb02e1c487371905cea is first bad commit
> commit 64e1b00c974ddeae6a60ebb02e1c487371905cea
> Author: Johannes Berg <johannes@...solutions.net>
> Date:   Fri Apr 24 16:05:16 2009 +0000
> 
>     mac80211: fix basic rate bitmap calculation

Well ... How much did your connection slow down? It is clear that this
commit might possibly slow down your connection, but not by a lot. And
that's only because before we were sending with a higher rate than the
AP allowed us to... If you need the higher speed then set your AP to
G-only to make it include more rates in the basic rate set, that'll
speed up your connection properly.

That's all discounting driver bugs which may exist, of course.

johannes

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