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

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To: A list for linux audio users <linux-audio-user@...>

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

Date: Wednesday, April 4, 2007 - 5:21 am

Lee Revell wrote:

quoted text> On 4/3/07, Brad Fuller  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.
>

quoted text>> 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)

quoted text> Audacity would work as it

> uses OSS compatibility layer which resamples in kernel space.