Roland Smith wrote:
On Tue, Nov 20, 2007 at 06:50:05PM +0100, Frank Staals wrote:
I updated to RELENG_7 yesterday, but I'm noticing that the snd_ich driver quite often skips playback for a short period of time at some points. Especially when doing mysql queries. Anyone else having problems with snd_ich ?


[EMAIL PROTECTED] uname -a
FreeBSD FStaals.net 7.0-BETA3 FreeBSD 7.0-BETA3 #2: Mon Nov 19 19:50:46 CET 2007 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/PFSERVERKERNEL amd64

[EMAIL PROTECTED] pciconf -lv
[EMAIL PROTECTED]:0:4:0: class=0x040100 card=0x71851462 chip=0x005910de rev=0xa2 hdr=0x00
   vendor     = 'Nvidia Corp'
   device     = 'Realtek ALC850 Realtek AC'97 Audio'
   class      = multimedia
   subclass   = audio

[EMAIL PROTECTED] dmesg | grep pcm
pcm0: <nVidia nForce4> port 0xea00-0xeaff,0xee00-0xeeff mem 0xfe02d000-0xfe02dfff irq 23 at device 4.0 on pci0
pcm0: [ITHREAD]
pcm0: <Avance Logic ALC850 AC97 Codec>

I've had trouble with skipping sound some time ago on machines with
another chipset;
$ cat /dev/sndstat FreeBSD Audio Driver (newpcm: 64bit 2007061600/amd64)
Installed devices:
pcm0: <VIA VT8237> at io 0xd800 irq 22 [MPSAFE] (5p:4v/1r:1v channels duplex default)

I put the following in /boot/device.hints

# Larger DMA buffer for the soundcard, for better sound quality.
hint.pcm.0.buffersize="16384"

This fixed the problem for me.

Roland
Ah thanks for the hint, but I'm guessing that won't work since aparently the buffersice is allready 16K :

[EMAIL PROTECTED] sysctl -a | grep pcm dev.pcm.0.%desc: nVidia nForce4
dev.pcm.0.%driver: pcm
dev.pcm.0.%location: slot=4 function=0 handle=\_SB_.PCI0.MACI
dev.pcm.0.%pnpinfo: vendor=0x10de device=0x0059 subvendor=0x1462 subdevice=0x7185 class=0x040100
dev.pcm.0.%parent: pci0
dev.pcm.0.eapd: 1
dev.pcm.0.play.vchans: 1
dev.pcm.0.play.vchanrate: 48000
dev.pcm.0.play.vchanformat: s16le
dev.pcm.0.rec.vchans: 1
dev.pcm.0.rec.vchanrate: 48000
dev.pcm.0.rec.vchanformat: s16le
dev.pcm.0.buffersize: 16384
dev.pcm.0.ac97rate: 48000

Anyone else a hint ?

--
-Frank Staals


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