Re: [Jack-Devel] L_ProAudio: A Linux Proaudio FrameWork with improved Wine/kernel(rt) support

Hi, i replied to jeremy off list, so i thought i would address this on
list, as well. (for those interested)

> * how do the above things influence Linux audio performance?

2 words: OS jitter.

> * what is delayed acpi?
> * what is indirect fan control?
> * what is tame conntrack?
> * what is stable_page_write?

delaying acpi, using an indirect patch to fan control and making sure
conntrack (netfilter) doesn't cause interference, ensures that we
don't have these kernel-level components causing inconsistent and
undesiered behavior (that can produce things like xruns /
interference.

Stable_page_write is fairly incompatible with wine and causes huse
latencies with [poll schedule timeouts], these can be very higher
numbers like 80 to 200+ms - which is TERRIBLE. Google, Oracle,
samsung, Bao Mao and others have chosen to revert this commit -
because they (in all of their glory) couldn't work around the issue ~
and neither can I.. That being said, this is a somewhat temparary
patch (although it has been is use by me, for quite some time now). I
know that a solution is just down the pipe, but may not surface for a
while yet. revert_stable_page_write.patch in my patchset is CRITICAL
for Wine, for now.

> * why 3.6? Aren't there still some issues with it (softirq related stuff)?

I was plagued by that, on one system ~ which appears to be fixed. ~
this led to me releasing L_ProAudio, after cleaning up and rebasing my
patchsets against upstream linux-rt and upstream wine.

so i guess the softirq problems, might be a blessing in disguise. (ie:
i have been using _most_ of L_Proaudio for months).

cheerz

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