Subject: Re: [LAU] eeepc 4G and ALSA underrun -> and jack and rt

From: ben <brouits@...> · Date: Thursday, July 23, 2009 - 8:55 pm

sh0099 a écrit :

quoted text> i have to say that i also have not so nice performance with jack on my

> eeepc 4g with a ubuntu-eee. does anybody knows if there is a rt kernel

> which works well with the eeepc 4g?

> i currently run ubuntu-eee 8.04.

I have noticed that stoping NetworkManager allows a better behaviour.

$ sudo /etc/init.d/NetworkManager stop

$ qjackctl

...
>

quoted text> ben schrieb:

>> Clemens Ladisch a écrit :

>>

>>> ben wrote:

>>>

>>>> i own an eeepc 4G (701) but ALSA makes a lot for underrun withe de Intel

>>>> soundcard (snd_hda_intel). Surprisingly, using the OSS emulation works

>>>> better.

>>>>

>>> The OSS emulation uses the same ALSA API internally; you should get the

>>> same behaviour if you configure your application, whatever it is, to use

>>> the same buffer/period sizes for ALSA as it uses for OSS.

>>>

>> OK. I saw some applications behave better than some other.

>> I'll RTFM on buffer/period sizes when the application alow to tweak it,

>> even if this can increase latency.

>>

>>

>>>> Is it possible to tell to snd_hda_intel to force the use of the

>>>> soundcard in a better IRQ ?

>>>>

>>> No, I/O-APIC interrupts (above 15) are hardwired.

>>>

>>>

>>> Best regards,

>>> Clemens

>>>

>> Thank you for the explanation on IRQs.

>> Benoît

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>>

>

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