[arch-general] regression in nouveau ?

[fons at kokkinizita.net]

On Wed, May 26, 2010 at 09:54:26AM +0200, Xavier Chantry wrote:

> On Wed, May 26, 2010 at 2:08 AM, Philipp Überbacher
> <hollunder at lavabit.com> wrote:
> >
> > Sadly audio performance / locks /latency seems to be not on graphics driver developers
> > minds at all.
> 
> It's definitely not their primary focus. But if you open a bug report
> saying "that commit greatly increased latency" and you can prove it,
> you can be sure they will do something about it.

I will. But my first concern ATM is to get this system in a usable
state - that's what the customer pays me for.

On of the many things I tried before even posting was to use the nv
driver. Modified the xorg.conf, but for some reason, the system
goes on using nouveau regardless. 

** Is it still possible to use nv on today's Arch ? **

I've used nv for years without any problem. The reason to prefer
it over nvidia was not ideological - nvidia has latency problems
as well, and I never needed 3D acceleration.

Looking at the xrun statistics in function of audio period size,
it looks like current nouveau is blocking audio (either by dis-
abling interrupts, or by locking a shared HW resource) for about
3-4 ms. *No* driver today should ever do that - it's really late
1990's performance. 

> The work to provide good, detailed, and useful bug reports is in
> user's hands, not developers'.
> When the users don't do their homework, regressions remain.

Agreed.

Ciao,

-- 
FA

O tu, che porte, correndo si ?
E guerra e morte !