linux-kernel - Re: [2.6.27-rc7 vs 2.6.29 Regresion] Wifi Network Slownes rt2500pci

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Date:	Mon, 25 May 2009 14:42:06 +0200
From:	Alejandro Riveira Fernández 
	<alejandro.riveira@...il.com>
To:	Ivo van Doorn <ivdoorn@...il.com>
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linville@...driver.com, Greg KH <greg@...ah.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [2.6.27-rc7 vs 2.6.29 Regresion] Wifi Network Slownes rt2500pci

El lun, 25-05-2009 a las 13:23 +0200, Ivo van Doorn escribió:
> On Monday 25 May 2009, Alejandro Riveira Fernández wrote:
> > I reported it previously but i'm resending it as a regresion
> > 
> > More info on the bugzilla
> > 
> >  http://bugzilla.kernel.org/show_bug.cgi?id=13362
> > 
> > I bisected it in the estable tree (it regresses too) and the revert
> > helps there but reverting the upstream commit in mainline does not help
> > to fix it completely...
> 
> Bug 9273 -  rt2500pci: low TCP throughput
> 	http://bugzilla.kernel.org/show_bug.cgi?id=9273
> 
> Bug 443203 -  Fedora rawhide + ralink = slow bit rate
> 	https://bugzilla.redhat.com/show_bug.cgi?id=443203
> 
> [Hardy][Intrepid] Low bandwidth with rt2400 / rt2500 drivers
> 	https://bugs.launchpad.net/ubuntu/+source/linux/+bug/190515
> 
> I can't call this a regression, dozens people have reported the problems
> ranging from kernels 2.6.25 to 2.6.29. Perhaps in your case it worked slightly
> better once, but that was not the case for all other users.
> 
> Have you tried the "iwconfig wlan0 rate54M" workaround?

   Yep during various releases I used that workaround but once I
switched to minstrel rate choosing alg (that's the neme isn't it) the
problem gone away and i got allways a good connection for several
releases and many kernels tried; till this patch. If I revert this patch
the problem goes away completly and reliably (i'm using 2.6.29.4 with
the patch reveted) so something has clearly regressed for me.

 You can see my coments ( ariveira ) on rt2x00 forums regarding the
issues you mention (low speed that gets fixed forcing the rate) in the
long thread about rt2500pci low rate[1].

 Checking the message i see that it was 2.6.27  when i began using
minstrel and got a rock solid connection in 2.6.27.x, 2.6.28.x and
2.6.29 minus 64e1b00c974ddeae6a60ebb02e1c487371905cea

 The problem is not that I get a low rate on connect (1Mbit) that i can
easily fix with iwconfig the problem is that with 54M (and 48M and the
like) connections I get a bumpy and low speed connection.

So I honesty think it is not the same issue and I hope you read this as
an interesting data point and not just as a duplicate.

Would the output of this script[2] for 2.6.29.4 with and without the
revert help you ?

> 
> Ivo

Thanks for the response

[1]
http://rt2x00.serialmonkey.com/phpBB/viewtopic.php?f=5&t=4579&start=45

[2] http://rt2x00.serialmonkey.com/phpBB/viewtopic.php?f=5&t=4660 

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