Handbook is unclear about the use of maxautovhans

[Christian Hiris]

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On Monday 13 December 2004 18:21, Nikolas Britton wrote:
> Excerpt from the handbook:
> "To set the number of virtual channels, there are two sysctl knobs
> which, if you are the root user, can be set like this:
>
> # sysctl hw.snd.pcm0.vchans=4
> # sysctl hw.snd.maxautovchans=4
>
> The above example allocates four virtual channels, which is a practical
> number for everyday use. hw.snd.pcm0.vchans is the number of virtual
> channels pcm0 has, and is configurable once a device has been attached.
> hw.snd.maxautovchans is the number of virtual channels a new audio
> device is given when it is attached using kldload(8)
> <http://www.FreeBSD.org/cgi/man.cgi?query=kldload&sektion=8>. Since the
> pcm module can be loaded independently of the hardware drivers,
> hw.snd.maxautovchans can store how many virtual channels any devices
> which are attached later will be given."
> ---------------------------
> So maxautovhans is only applicable if you loaded sound support as a
> kernel module and not compile it into the kernel?

No, (speaking for the 5.3-STABLE branch) sysctl hw.snd.maxautovchans also 
works, if sound support has been compiled into your kernel. You can set the 
sysctl via /etc/sysctl.conf or /boot/loader.conf or commandline. 

According to 'man 4 sound', sysctl hw.snd.maxautovchans holds the maximum 
number of vchans, that the system will be allowed to create. The sentence 
"hw.snd.maxautovchans is the number of virtual channels a new audio device is 
given when it is attached using kldload(8)" is possibly wrong. I must admit 
that I have never tested sound-module loading via kldload.

- -- 
Christian Hiris <4711 at chello.at> | OpenPGP KeyID 0x3BCA53BE 
OpenPGP-Key at hkp://wwwkeys.eu.pgp.net and http://pgp.mit.edu
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