[pulseaudio-discuss] Distribution kernels and glitch-free (Packagers, read this!)

[Mark Greenwood]

On Monday 23 February 2009 17:42:44 Colin Guthrie wrote:
> 'Twas brillig, and Lennart Poettering at 23/02/09 16:31 did gyre and gimble:
> > On Mon, 23.02.09 10:14, Colin Guthrie (gmane at colin.guthr.ie) wrote:
> > 
> >> 'Twas brillig, and Lennart Poettering at 23/02/09 02:05 did gyre and gimble:
> >>> OpenSUSE apparently does not enable it. The same is true for
> >>> Ubuntu. Same for Debian. Note sure about Mandriva.
> >> Here is a (not quite current) grep from my running kernel (it's .27 as  
> >> .28/.29 both break my intel graphics :( at the moment):
> >>
> >> $ zgrep -E "HZ|PREEMP" /proc/config.gz
> >> CONFIG_PREEMPT_NOTIFIERS=y
> >> CONFIG_NO_HZ=y
> >> # CONFIG_PREEMPT_NONE is not set
> >> CONFIG_PREEMPT_VOLUNTARY=y
> >> # CONFIG_PREEMPT is not set
> >> # CONFIG_HZ_100 is not set
> >> # CONFIG_HZ_250 is not set
> >> # CONFIG_HZ_300 is not set
> >> CONFIG_HZ_1000=y
> >> CONFIG_HZ=1000
> >> CONFIG_MACHZ_WDT=m
> >>
> >> I'll ask our kernel team why PREEMPT is not on as I've no idea of the  
> >> consequences. My guess is that it relates to graphics drivers...
> > 
> > The Fedora kernels set PREEMPT_VOLUNTARY as well as it seems.
> 
> Yeah, I asked this of one of our Kernel guys. This is his response, 
> which seems pretty sensible and balanced to me :)
> 
> 
> 
> Well, Lennart actually answered your question  ;-)
> 
> Full Preempt used to break several drivers, including graphic, wireless, ...
> 

I've been running a homespun full preempt (and indeed, RT) kernel on Mandriva while using several "dodgy" drivers (nvidia, atheros) for a couple of years without any trouble.

On the other hand Ubuntu's non-preempt 300Hz kernel is nothing but trouble... go figure??

Mark