Re: [PATCH v2] iwlagn: use cts-to-self protection on 5000 adapters series

["John W. Linville" <linville@tuxdriver.com>]

On Mon, Jun 06, 2011 at 10:58:52AM +0200, Stanislaw Gruszka wrote:
> On Thu, May 26, 2011 at 07:50:42AM -0700, Guy, Wey-Yi wrote:
> > On Thu, 2011-05-26 at 08:14 -0700, Stanislaw Gruszka wrote:
> > > This patch fixes 802.11n stability and performance regression we have
> > > since 2.6.35. It boost performance on my 5GHz N-only network from about
> > > 5MB/s to 8MB/s. Similar percentage boost can be observed on 2.4 GHz.
> > > 
> > > These are test results of 5x downloading of approximately 700MB iso
> > > image:
> > > 
> > > vanilla: 5.27 5.22 4.94 4.47 5.31 ; avr 5.0420 std 0.35110
> > > patched: 8.07 7.95 8.06 7.99 7.96 ; avr 8.0060 std 0.055946
> > > 
> > > This was achieved with NetworkManager configured to do not perform
> > > periodical scans, by configuring constant BSSID. With periodical scans,
> > > after some time, performance downgrade to unpatched driver level, like
> > > in example below:
> > > 
> > > patched: 7.40 7.61 4.28 4.37 4.80 avr 5.6920 std 1.6683
> > > 
> > > However patch still make better here, since similar test on unpatched
> > > driver make link disconnects with below messages after some time:
> > > 
> > > wlan1: authenticate with 00:23:69:35:d1:3f (try 1)
> > > wlan1: authenticate with 00:23:69:35:d1:3f (try 2)
> > > wlan1: authenticate with 00:23:69:35:d1:3f (try 3)
> > > wlan1: authentication with 00:23:69:35:d1:3f timed out
> > > 
> > > On 2.6.35 kernel patch helps against connection hangs with messages:
> > > 
> > > iwlagn 0000:20:00.0: queue 10 stuck 3 time. Fw reload.
> > > iwlagn 0000:20:00.0: On demand firmware reload
> > > iwlagn 0000:20:00.0: Stopping AGG while state not ON or starting
> > > 
> > > Cc: stable@kernel.org # 2.6.35+
> > > Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
> > Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
> 
> John, can you apply that patch and push upstream? Or should I
> repost? I want backport it to Fedora 2.6.35 as it fixes random
> 11n connection hangs there (common F-14 bug).

Sorry, I was waiting to see if Daniel was going to reply further...

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.