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From: Tijl Coosemans <tijl@ulyssis.org>
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Date: Sat, 14 Jul 2007 18:46:13 +0200
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Subject: Re: syscons + mouse == stuttering playback
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On Monday 02 July 2007 20:51:09 Ulrich Spoerlein wrote:
> on a recent CURRENT, without WITNESS or INVARIANTS. Both with
> SCHED_ULE and SCHED_4BSD I observed the following:
> 
> Make sure almost nothing is running (to rule out other influences).
> Run mpg123 on some MP3 file. Then start moving the syscons mouse
> cursor. I get a high frequency stuttering on playback, playback is
> also slowed down.
> 
> I'm using kern.hz=100, if it matters. Is somebody able to reproduce
> it?

I just noticed it. I was playing music in Amarok, switched to a text
terminal and moving the mouse there causes stuttering. In X it
doesn't...

> cat /dev/sndstat 
> FreeBSD Audio Driver (newpcm: 32bit 2007061600/i386)
> Installed devices:
> pcm0: <Intel ICH4 (82801DB)> at io 0xf4fff800, 0xf4fff400 irq 9 bufsz 16384 kld snd_ich [MPSAFE] (1p:1v/1r:1v channels duplex default)

I have exactly the same, but irq 4.

> dev.pcm.0.%desc: Intel ICH4 (82801DB)
> dev.pcm.0.%driver: pcm
> dev.pcm.0.%location: slot=31 function=5 handle=\_SB_.PCI0.AUD_
> dev.pcm.0.%pnpinfo: vendor=0x8086 device=0x24c5 subvendor=0x1028 subdevice=0x0191 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