[pulseaudio-discuss] Yet another attempt to fight rewinds

[David Henningsson]

On 09/20/2011 10:21 AM, Lu Guanqun wrote:
> On Mon, Sep 19, 2011 at 11:49:03PM +0800, David Henningsson wrote:
>> A few Atom users have complained about enternal rewinds since they
>> upgraded to 0.99.x, see
>> https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/825709
>>
>> So here's just an idea. As a "last resort", ratelimit the number of
>> rewinds. If there are more than 10 rewinds in 200 ms, go to sleep for
>> 200 ms. The idea is that during those 200 ms, the client application
>> will produce enough packets to fill up the buffer enough. Those packets
>> will then be merged into one, due to an earlier rewind patch that is
>> already in. The 200 ms sleep might cause a noticable glitch, but
>> hopefully we get that one glitch only instead of complete brokenness.
>>
>> But I don't have any such setup here currently, so maybe any of you
>> could check this patch and see if it works as intended, and has real effect?
>
> Hi David,
>
> Thanks for the patch, rate limiting the rewinding seems a good idea,
> however, I don't have Atom machine right on my hand. I met the flood of
> rewinds before, but that was later root caused to the wrong report of
> timing info from underlying device. After this was fixed, no flood of
> rewinds were seen.
>

Hi Lu,

This is interesting. If there was something in the kernel that makes 
Atom HDA controllers (?) report the wrong timing info, and this was 
later fixed, could you point me to that patch?

Thanks in advance!

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic