Re: ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

On Wed, Feb 17, 2016 at 1:23 AM, Krishna Chaitanya wrote: > From a quick glance of symptoms, i think the below patch is worth a > try, even though > i don't see you are doing any background scans for which this applies. > > https://patchwork.kernel.org/patch/8015321/

Re: ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

On Wed, Feb 17, 2016 at 10:02 AM, Avery Pennarun wrote: > > On Tue, Feb 16, 2016 at 5:05 PM, Johannes Berg > wrote: > > On Tue, 2016-02-16 at 16:28 -0500, Avery Pennarun wrote: > >> Changing default_agg_timeout to zero (as it is on most non-ath9k >

Re: ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

On Tue, Feb 16, 2016 at 5:05 PM, Johannes Berg wrote: > On Tue, 2016-02-16 at 16:28 -0500, Avery Pennarun wrote: >> Changing default_agg_timeout to zero (as it is on most non-ath9k >> drivers) makes the problem pretty much go away. However, I think >> it's because I'm

Re: ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

On Tue, 2016-02-16 at 16:28 -0500, Avery Pennarun wrote: >  > Changing default_agg_timeout to zero (as it is on most non-ath9k > drivers) makes the problem pretty much go away.  However, I think > it's because I'm just dodging the code path that triggers a race > condition. That does seem likely.

Re: ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

Okay, I've made much more progress on this old thread. I haven't actually fixed the bug, which I suspect is a race condition only on multicore machines, but I at least have better reproduction steps and a workaround. The bug seems to trigger when three things happen at once: 1) Background

ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

[fixed ath9k list address. sorry for the spam] Hi all, I have a pretty weird problem I've been chasing for a few weeks and have narrowed it down, but not quite solved it. It may be caused by bugs in aggregation-related code. Steps: - Set up an ath9k-based Linux AP on an ARM processor

ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins

Hi all, I have a pretty weird problem I've been chasing for a few weeks and have narrowed it down, but not quite solved it. It may be caused by bugs in aggregation-related code. Steps: - Set up an ath9k-based Linux AP on an ARM processor (currently using this version of backports, though I've