[pulseaudio-discuss] [RFC PATCH] alsa-sink: Reduce hardware pointer update syscalls

[David Henningsson]

On 2014-09-29 14:49, Alexander E. Patrakov wrote:
> 29.09.2014 18:16, David Henningsson wrote:
>> Ah, now I get it - the problem is not that the buffer might become half
>> empty, the problem is that you might estimate to sleep too long, so your
>> process time is effectively cut in half: if you previously had problems
>> with process times > 20 ms, you can now potentially have problems with
>> process times > 10 ms.
>>
>> I doubt this is a blocker, as this will resolve itself naturally since
>> the potential underruns that might occur will just cause the process
>> time to increase, but it's a very valid point and worthy some thought in
>> case this patch will ever be v2.
>>
>> (Still waiting for somebody to report back that it's actually making a
>> difference - otherwise I won't fix anything that isn't broken.)
>
> I think it is worth testing on a Xonar DX or any other card with an
> insanely large FIFO size. Unfortunately, I don't own this card, and it
> would be a rather big stretch to ask my friend (who has it) to test a
> patched version of PulseAudio :(

I don't have any Xonar DX card either, but out of curiousity, what FIFO 
size, in actual numbers/latency, is it that you would call "insanely large"?


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