no_period_wakeup, axfer and --sched-model=timer

[Cezary Rojewski]

On 2021-05-13 3:59 PM, Takashi Sakamoto wrote:
> On Thu, May 13, 2021 at 03:37:02PM +0200, Amadeusz Sławiński wrote:
>> On 5/13/2021 3:25 PM, Takashi Sakamoto wrote:
>>> Hi,
>>>
>>> On Thu, May 13, 2021 at 01:34:25PM +0200, Amadeusz Sławiński wrote:
>>>> I was checking some stuff relater to NO_PERIOD_WAKEUP and noticed that axfer
>>>> has support for using either --sched-model=irq or --sched-model=timer.
>>>> However from few quick tests it seems like it doesn't work?

...

>>> It's a regression added by a commit e5e6a7838b06 ("axfer: return ETIMEDOUT
>>> when no event occurs after waiter expiration"), and the -ETIMEDOUT come
>>> neither from ALSA PCM core nor alsa-lib. Thanks for your reporting!
>>>
>>>    * https://github.com/alsa-project/alsa-utils/commit/e5e6a7838b06
>>>
>>> As a quick fix, please revert the commit. I'll post better fixes later.
>>>
>>> After the revert, it looks work well under my hardware:
>>>
>>
>> Yes, I can confirm, that it fixes the problem. Thanks for quick workaround!
> 
> That's good. I just filed the better fix. Please apply it with your local
> repository instead of the revert patch.
> 
>   * alsa-utils: axfer: fix regression of timeout in timer-based scheduling model #88
>    * https://github.com/alsa-project/alsa-utils/pull/88
> 
> Anyway, thank you for reporting the bug. In recent years I've been
> working for devices in which no-period-wakeup is unavailable, so I
> overlooked the bug so long...

No problem Takashi, happens to us all. We thank you for a very quick 
reply and solving the issue.

Regards,
Czarek