[LAU] Installing realtime kernel - getting it to work.

[Brad Fuller]

Lee Revell wrote:
> On 4/3/07, Brad Fuller <brad at sonaural.com> wrote:
>> Geoff Beasley wrote:
>> > On Wednesday 04 April 2007 09:52:16 Brad Fuller wrote:
>> >
>> >
>> >> Right, these are all set except for: hpet (my cpu is too old), but 
>> I'll
>> >> set it anyway and "Tickless System." Is this what you are 
>> referring to
>> >> when you speak of "tickless timers"?
>> >>
>> >
>> > yup. it'll help.   what are the exact symptoms ? you should be 
>> having no
>> > problem at all...
>> >
>> my only problems now are outside of jack, - i think jack works ok. Using
>> the xine engine in amarok produces lots of clicks. Moving to the Helix
>> engine works much better.
>> Audacity, w/o jack, clicks too with any typing, net, window movement...
>> the usual.
>>
>
> Did you make sure that the soundcard IRQ is higher prio than all other
> IRQs and that Audacity has realtime mode enabled (actually I have no
> idea whether it has such a thing but it should)

I'll check.

>
>> I'm also concerned with the playback rate. Some apps playback too slow
>> (amarok and snd, neither with jack) while audacity plays back at the
>> right sample rate (with or w/o jack).
>
> Probably your hardware only supports 48Khz but these apps use a hw
> device which disables software resampling.  

ahh... (I'm using a Delta66 in this PC and it goes up to 96kHz)
> Audacity would work as it
> uses OSS compatibility layer which resamples in kernel space.