i have Ensoniq ES1371-based soundcard supported by pcm driver and
experience some problems. the sound played is interruped by clicks and
distorsions, and they appear more often when the disk activity is high.
during playback the kernel generates messages like 'pcm0: hwptr went
backwards 64 -> 32'. any ideas?

here is my dmesg:

Copyright (c) 1992-2001 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.0-CURRENT #2: Thu Feb  8 18:19:26 MSK 2001
    [EMAIL PROTECTED]:/garbage/src/sys/compile/CAMEL
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 550023689 Hz
CPU: AMD Athlon(tm) Processor (550.02-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x621  Stepping = 1
  AMD Features=0xc0400000<AMIE,DSP,3DNow!>
real memory  = 134135808 (130992K bytes)
avail memory = 125829120 (122880K bytes)
Preloaded elf kernel "kernel" at 0xc03de000.
Pentium Pro MTRR support enabled
Using $PIR table, 8 entries at 0xc00f15e0
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 4.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686 ATA66 controller> port 0xd800-0xd80f at device 4.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <serial bus, USB> at 4.2 (no driver attached)
pci0: <serial bus, USB> at 4.3 (no driver attached)
pcm0: <AudioPCI ES1371> port 0xa400-0xa43f irq 9 at device 9.0 on pci0
ahc0: <Adaptec aic7850 SCSI adapter> port 0xa000-0xa0ff mem 0xe1800000-0xe1800fff irq 
5 at device 10.0 on pci0
aic7850: Single Channel A, SCSI Id=7, 3/255 SCBs
xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0x9800-0x987f mem 0xe1000000-0xe100007f 
irq 10 at device 11.0 on pci0
xl0: Ethernet address: 00:10:5a:74:c4:6c
miibus0: <MII bus> on xl0
xlphy0: <3Com internal media interface> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
psm0: <PS/2 Mouse> flags 0x8000 irq 12 on atkbdc0
psm0: model NetMouse/NetScroll Optical, device ID 0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
unknown: <PNP0401> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0700> can't assign resources
unknown: <PNP0f13> can't assign resources
unknown: <PNP0303> can't assign resources
atspeaker0: <AT speaker> at port 0x61 on isa0
IP packet filtering initialized, divert enabled, rule-based forwarding disabled, 
default to deny, logging limited to 200 packets/entry by default
ncp_load: [210-213]
ad0: 8223MB <ST38410A> [16708/16/63] at ata0-master UDMA66
acd0: CDROM <CREATIVE CD5220> at ata1-master using WDMA2
Waiting 5 seconds for SCSI devices to settle
Mounting root from ufs:/dev/ad0s1a
xl0: promiscuous mode enabled
/dev/vmmon: Module vmmon: registered with major=200 minor=0 tag=$Name: build-570 $
/dev/vmmon: Module vmmon: initialized

ilya naumov (at work)

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