Changing hw.snd.pcm0.buffersize in 4.10.

[Nikolas Britton]

Sandy Rutherford wrote:

>>>>>>On Mon, 13 Dec 2004 09:59:51 -0600, 
>>>>>>Nikolas Britton <freebsd at nbritton.org> said:
>>>>>>            
>>>>>>
>
> > In FreeBSD 5.3 you can change the buffersize by adding 
> > hint.pcm.0.buffersize="foo" to /boot/loader.conf, have you try'ed this 
> > with 4.x?
>
>Yes.  Here are the contents of my /boot/loader.conf file:
>
>[szamoca:6] cat /boot/loader.conf
># -- sysinstall generated deltas -- #
>userconfig_script_load="YES"
>hint.pcm.0.buffersize=8192
>  
>
I'm not sure if it makes a difference but 8192 is not in "quotes" like I 
have in my working example and man device.hints says it should look like 
this: hint.driver.unit.keyword="value", also, have you tried playing 
with targetirqrate? 
http://www.freebsd.org/cgi/man.cgi?query=snd&apropos=0&sektion=0&manpath=FreeBSD+5.3-RELEASE+and+Ports&format=html

spectra# more /boot/loader.conf
## Video Support
nvidia_load="YES"
linux_load="YES"
#vesa_load="YES"

## Sound Support
#sound_load="YES"
#snd_emu10k1_load="YES"
#snd_driver_load="YES"
hw.snd.maxautovchans=4
hw.snd.targetirqrate=48
hint.pcm.0.buffersize="8192"

## Misc.
loader_color="YES" #Color Boot Menu

spectra# sysctl hw.snd
hw.snd.targetirqrate: 48
hw.snd.report_soft_formats: 1
hw.snd.verbose: 1
hw.snd.unit: 0
hw.snd.maxautovchans: 4
hw.snd.pcm0.buffersize: 8192
hw.snd.pcm0.vchans: 0




>However,
>
>[szamoca:7] sysctl -a | grep snd
>hw.snd.targetirqrate: 32
>hw.snd.report_soft_formats: 1
>hw.snd.verbose: 1
>hw.snd.maxautovchans: 0
>hw.snd.pcm0.buffersize: 4096
>hw.snd.pcm0.vchans: 4
>
>So it seems to have ignored the entry in loader.conf.  No errors or
>warnings were generated during boot.  It just ignored the entry.
>
>Also, here is my /dev/sndstat:
>
>[szamoca:8] cat /dev/sndstat
>FreeBSD Audio Driver (newpcm)
>Installed devices:
>pcm0: <SB16 DSP 4.02> at io 0x220 irq 5 drq 1:0 bufsz 4096d (1p/1r/4v channels duplex)
>
>Also,
>
>[szamoca:9] uname -a 
>FreeBSD szamoca.krvarr.bc.ca 4.10-RELEASE FreeBSD 4.10-RELEASE #35: Sat Sep 18 02:19:02 PDT 2004     root at szamoca.krvarr.bc.ca:/usr/src/sys/compile/SZAMOCA  i386
>
> > Sandy Rutherford wrote:
>
> >> Is it possible to change the sysctl variable hw.snd.pcm0.buffersize
> >> (DMA buffer size for the soundcard) in FreeBSD 4.10?  I know that in
> >> 5.x this is changed in devices.hints.  I'm guessing that something in
> >> the kernel config file will do the job, but haven't been able to
> >> figure out what.
> >>  ....
>
>Thanks,
>Sandy
>_______________________________________________
>freebsd-questions at freebsd.org mailing list
>http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>
>  
>