Changing hw.snd.pcm0.buffersize in 4.10.
Sandy Rutherford
sandy at krvarr.bc.ca
Mon Dec 13 18:18:30 PST 2004
>>>>> 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
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
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