[linux-audio-user] Which kernel for low latency?

[Glenn McCord]

That link is useful. I've been trying to find out what the mm stood for.
And I have sound working now. As it turns out I think I needed to 
compile in not only:
<*> EMU10K1 (SB Live! & Audigy, E-mu APS)
but...
<*> (Creative) Ensoniq AudioPCI 1370
<*> (Creative) Ensoniq AudioPCI 1371/1373
aswell.

Now I'm off to get jack running but I've had really bad form with that 
and the 2.6

Q. With the 2.4 kernel, low-latency was seen to be working by going:
cat /proc/sys/kernel/lowlatency

but now all I get is:
root at upstairs linux # cat /proc/sys/kernel/lowlatency
cat: /proc/sys/kernel/lowlatency: No such file or directory

How does the 2.6 use low-latency audio? Is it buried deep amongst the 
features now, and working by default?

Thanks.




James Stone wrote:

>Interesting.
>
>I think you will find the question was about 2.6 tho..
>
>James
>
>On Sat, Jan 17, 2004 at 02:40:21PM -0500, lee at fallingforward.net wrote:
>  
>
>>Linux angry-boomer 2.4.23-aa1 #5 Sun Jan 4 13:01:01 EST 2004 i686 AMD
>>Athlon(tm) XP 2200+ AuthenticAMD GNU/Linux
>>
>>the distro is Gentoo. the kernel contains Andrea Arcangeli's patches. A
>>description is here:
>>http://www.gentoo.org/doc/en/gentoo-kernel.xml
>>
>>-lee
>>
>>On Sat, 17 Jan 2004, Glenn McCord wrote:
>>
>>    
>>
>>>I've been using a 2.4.2 kernel with Andrew Morton's patches and I got
>>>jack to work very well. However, seeing 2.6 is the latest and greatest
>>>I'd like to switch but am having no luck thus far.
>>>
>>>Q. If anyone has got jack to work great with a 2.6(.1) kernel could you
>>>share with me what version of the 2.6 kernel you used and what patches
>>>(if any)
>>>
>>>At the moment I'm trying a 2.6.1 with an mm4 patch but I'm getting no
>>>sound with my soundblaster live.
>>>I've done:
>>>       <*> Sound card support
>>>
>>>and, under Advanced Linux Sound Architecture --->
>>>
>>>       <*> Advanced Linux Sound Architecture
>>>       <*> Sequencer support
>>>       <*> OSS API emulation
>>>       <*> OSS Mixer API
>>>       <*> OSS PCM (digital audio) API
>>>       <*> OSS Sequencer API
>>>
>>>rebooted and install alsa-lib-1.0.1 and alsa-utils-1.0.1 as well but I
>>>get these errors
>>>
>>>root at upstairs glenn # aplay /usr/kde/3.2/share/sounds/pop.wav
>>>ALSA lib pcm_hw.c:1055:(snd_pcm_hw_open) open /dev/snd/pcmC0D0p failed:
>>>No such file or directory
>>>aplay: main:502: audio open error: No such file or directory
>>>
>>>and
>>>
>>>glenn at upstairs glenn $ alsamixer
>>>No mixer elems found
>>>
>>>I'm at a loss but am interested at what type of kernel others are using.
>>>I think my next best bet is to remove alsa from the kernel and install
>>>it seperately.
>>>
>>>Thanks
>>>
>>>
>>>      
>>>
>
>
>  
>