compat-wireless-2009-08-13 ath9k timeouts

compat-wireless-2009-08-13 ath9k timeouts

[Howard Chu]

I just built this on my 2.6.31-rc5 kernel. Using the driver results in a flood of

[   78.598403] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.599508] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.600500] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.600833] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.600833] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.600833] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT
[   78.601378] ath9k: AR_INTR_SYNC_LOCAL_TIMEOUT

in dmesg, and throughput is extremely slow. Surprising that there are multiple 
messages in a single time tick.

I also tried with the ath9k driver from wireless-testing, as of commit 
3fbf09eb3916 and got the same result.

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/

Re: compat-wireless-2009-08-13 ath9k timeouts

[Howard Chu]

After reading this hint

> From: Sujith <Sujith.Manoharan@...>
> Subject: Re: Revert commit in ath9k
> Date: 2009-08-14 06:17:42 GMT (5 hours and 20 minutes ago)
>
> Pavel Roskin wrote:
>> Quoting Sujith <Sujith.Manoharan@...>:
>>
>> > John,
>> >
>> > Can you revert the commit - "ath9k: Change DEBUG level for certain
>> > interrupts" ?
>> > This interrupt seems to trigger fairly often and floods the log.

I reverted that commit in my build, and things were a bit more usable. But now 
I'm seeing this momentary pauses, and this in dmesg:

[22479.126146] wlan0: associated
[22734.695276] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x40000020
[22978.405252] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x42000020

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/