Hi,
today I upgraded my 5.0-CURRENT from PRE_SMPNG to -current from about 5-6
hours. everything went fine, the system is working, but I now notice the 
following: whenever I compile something (say a port) and play an mp3
in xmms at the same time, the mp3 playing is frequently interrupted,
or loops for a second. when I stop the compile, the mp3 files are playing
ok. with PRE_SMPNG I never experienced such behavior, even with 2 or 3
simultaneous compiles. I am attaching the dmesg output and my kernel
config file if that would be helpful.

as you can see, pcm shows:
        pcm0: hwptr went backwards 3896 -> 3720

with PRE_SMPNG it didn't show such things, and when I do not load the machine
with compiles, it never displays such messages and plays fine.

any info will be greatly appreciated.

-tacho

--
   [i don't follow] | [http://daemonz.org/ || [EMAIL PROTECTED]]
   [everything should be made as simple as possible, but no simpler]
   0x44FC3339 || [02B5 798B 4BD1 97FB F8DB 72E4 DCA4 BE03 44FC 3339]
#
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the NOTES configuration file. If you are
# in doubt as to the purpose or necessity of a line, check first in NOTES.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.291 2000/11/15 18:36:24 imp Exp $

machine         i386
#cpu            I386_CPU
#cpu            I486_CPU
#cpu            I586_CPU
cpu             I686_CPU
ident           THING
maxusers        32

#To statically compile in device wiring instead of /boot/device.hints
#hints          "GENERIC.hints"         #Default places to look for devices.

#makeoptions    DEBUG=-g                #Build kernel with gdb(1) debug symbols

#options        MATH_EMULATE            #Support for x87 emulation
options         INET                    #InterNETworking
options         INET6                   #IPv6 communications protocols
options         FFS                     #Berkeley Fast Filesystem
options         FFS_ROOT                #FFS usable as root device [keep this!]
options         SOFTUPDATES             #Enable FFS soft updates support
options         MFS                     #Memory Filesystem
options         MD_ROOT                 #MD is a potential root device
options         NFS                     #Network Filesystem
options         NFS_ROOT                #NFS usable as root device, NFS required
options         MSDOSFS                 #MSDOS Filesystem
options         CD9660                  #ISO 9660 Filesystem
options         CD9660_ROOT             #CD-ROM usable as root, CD9660 required
#options        DEVFS                   #Device Filesystem
options         PROCFS                  #Process filesystem
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         SCSI_DELAY=15000        #Delay (in ms) before probing SCSI
options         UCONSOLE                #Allow users to grab the console
options         USERCONFIG              #boot -c editor
options         VISUAL_USERCONFIG       #visual boot -c editor
options         KTRACE                  #ktrace(1) support
options         SYSVSHM                 #SYSV-style shared memory
options         SYSVMSG                 #SYSV-style message queues
options         SYSVSEM                 #SYSV-style semaphores
options         P1003_1B                #Posix P1003_1B real-time extensions
options         _KPOSIX_PRIORITY_SCHEDULING
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev

# To make an SMP kernel, the next two are needed
#options        SMP                     # Symmetric MultiProcessor Kernel
#options        APIC_IO                 # Symmetric (APIC) I/O

device          isa
#device         eisa
device          pci
#options        COMPAT_OLDISA           # compatability shims for lnc, le
#options        COMPAT_OLDPCI           # compatability shims for lnc

# Floppy drives
device          fdc

# ATA and ATAPI devices
device          ata
device          atadisk                 # ATA disk drives
device          atapicd                 # ATAPI CDROM drives
#device         atapifd                 # ATAPI floppy drives
#device         atapist                 # ATAPI tape drives
options         ATA_STATIC_ID           #Static device numbering
options         ATA_ENABLE_ATAPI_DMA    #Enable DMA on ATAPI devices

# SCSI Controllers
#device         ahb             # EISA AHA1742 family
#device         ahc             # AHA2940 and onboard AIC7xxx devices
#device         amd             # AMD 53C974 (Teckram DC-390(T))
#device         isp             # Qlogic family
#device         ncr             # NCR/Symbios Logic
#device         sym             # NCR/Symbios Logic (newer chipsets + those of `ncr')

#device         adv             # Advansys scsi adapters
#device         adw             # Advansys wide scsi adapters
#device         aha     1       # Adaptec 154x scsi adapters
#device         aic             # Adaptec 15[012]x scsi adapters, AIC-6[23]60.
#device         bt              # Buslogic/Mylex MultiMaster scsi adapters

#device         ncv             # NCR 53C500
#device         nsp             # Workbit Ninja SCSI-3
#device         stg             # TMC 18C30/18C50

# RAID controllers interfaced to the SCSI subsystem
#device         asr             # DPT SmartRAID V, VI and Adaptec SCSI RAID
#device         dpt             # DPT Smartcache III, IV - See NOTES for options!
#device         mly             # Mylex AcceleRAID/eXtremeRAID

# SCSI peripherals
#device         scbus           # SCSI bus (required)
#device         da              # Direct Access (disks)
#device         sa              # Sequential Access (tape etc)
#device         cd              # CD
#device         pass            # Passthrough device (direct SCSI access)

# RAID controllers
#device         aac             # Adaptec FSA RAID
#device         amr             # AMI MegaRAID
#device         ida             # Compaq Smart RAID
#device         mlx             # Mylex DAC960 family
#device         twe             # 3ware ATA RAID

# atkbdc0 controls both the keyboard and the PS/2 mouse
device          atkbdc  1       # At keyboard controller
device          atkbd           # at keyboard
device          psm             # psm mouse

device          vga             # VGA screen

# splash screen/screen saver
device          splash

# syscons is the default console driver, resembling an SCO console
device          sc      1

# Enable this for the pcvt (VT220 compatible) console driver
#device         vt
#options        XSERVER                 # support for X server on a vt console
#options        FAT_CURSOR              # start with block cursor
# If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines
#options        PCVT_SCANSET=2          # IBM keyboards are non-std

# Floating point support - do not disable.
device          npx

# Power management support (see NOTES for more options)
device          apm
# Add suspend/resume support for the i8254.
device          pmtimer

# Audio support
device          pcm

# PCCARD (PCMCIA) support
#device         card            # pccard bus
#device         pcic            # PCMCIA bridge

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

# Parallel port
device          ppc
device          ppbus           # Parallel port bus (required)
device          lpt             # Printer
#device         plip            # TCP/IP over parallel
device          ppi             # Parallel port interface device
#device         vpo             # Requires scbus and da


# PCI Ethernet NICs.
#device         de              # DEC/Intel DC21x4x (``Tulip'')
#device         fxp             # Intel EtherExpress PRO/100B (82557, 82558)
#device         vx              # 3Com 3c590, 3c595 (``Vortex'')
#device         wx              # Intel Gigabit Ethernet Card (``Wiseman'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
#device         dc              # DEC/Intel 21143 and various workalikes
#device         pcn             # AMD Am79C79x PCI 10/100 NICs
#device         rl              # RealTek 8129/8139
#device         sf              # Adaptec AIC-6915 (``Starfire'')
#device         sis             # Silicon Integrated Systems SiS 900/SiS 7016
#device         ste             # Sundance ST201 (D-Link DFE-550TX)
#device         tl              # Texas Instruments ThunderLAN
#device         tx              # SMC EtherPower II (83c170 ``EPIC'')
#device         vr              # VIA Rhine, Rhine II
#device         wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# ISA Ethernet NICs.  pccard nics included.
#device         cs              # Crystal Semiconductor CS89x0 NIC
#device         ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards
#device         ex              # Intel EtherExpress Pro/10 and Pro/10+
#device         ep              # Etherlink III based cards
#device         fe              # Fujitsu MB8696x based cards
#device         sn              # SMC's 9000 series of ethernet chips
#device         xe              # Xircom pccard ethernet

# The probe order of these is presently determined by i386/isa/isa_compat.c.
#device         ie
#device         le
#device         lnc

# Wireless NIC cards
#device         an              # Aironet 4500/4800 802.11 wireless NICs. 
#device         awi             # BayStack 660 and others
#device         wi              # WaveLAN/IEEE 802.11 wireless NICs. 
#device         wl              # Older non 802.11 Wavelan wireless NIC.

# Pseudo devices - the number indicates how many units to allocated.
device          random          # Entropy device
options         NOBLOCKRANDOM   # avoid any blocking on device random
device          loop            # Network loopback
device          ether           # Ethernet support
#device         sl              # Kernel SLIP
#device         ppp     1       # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          gif     4       # IPv6 and IPv4 tunneling
device          faith   1       # IPv6-to-IPv4 relaying (translation)

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
device          bpf             # Berkeley packet filter

# USB support
#device         uhci            # UHCI PCI->USB interface
#device         ohci            # OHCI PCI->USB interface
#device         usb             # USB Bus (required)
#device         udbp            # USB Double Bulk Pipe devices
#device         ugen            # Generic
#device         uhid            # "Human Interface Devices"
#device         ukbd            # Keyboard
#device         ulpt            # Printer
#device         umass           # Disks/Mass storage - Requires scbus and da
#device         ums             # Mouse
#device         urio            # Diamond Rio 500 MP3 player
#device         uscanner        # Scanners
# USB Ethernet, requires mii
#device         aue             # ADMtek USB ethernet
#device         cue             # CATC USB ethernet
#device         kue             # Kawasaki LSI USB ethernet

device          pcm
Copyright (c) 1992-2000 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 #0: Mon Nov 20 09:47:33 EET 2000
    [EMAIL PROTECTED]:/usr/src/sys/compile/THING
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 334093718 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (334.09-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x660  Stepping = 0
  
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory  = 134152192 (131008K bytes)
config> q
avail memory = 127025152 (124048K bytes)
Preloaded elf kernel "kernel" at 0xc0381000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc038109c.
Pentium Pro MTRR support enabled
md0: Malloc disk
Using $PIR table, 9 entries at 0xc00fdee0
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Intel 82443BX (440 BX) host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pcib1: <Intel 82443BX (440 BX) PCI-PCI (AGP) bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <ATI Mach64-GB graphics accelerator> at 0.0 irq 9
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xf000-0xf00f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <Intel 82371AB/EB (PIIX4) USB controller> at 7.2 irq 9
pci0: <Intel 82371AB Power management controller> at 7.3
xl0: <3Com 3c980 Fast Etherlink XL> port 0xd400-0xd47f mem 0xd9000000-0xd900007f irq 
10 at device 13.0 on pci0
xl0: Ethernet address: 00:50:04:13:ad:d0
miibus0: <MII bus> on xl0
xlphy0: <3Com internal media interface> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
atapci1: <HighPoint HPT370 ATA100 controller> port 
0xe800-0xe8ff,0xe400-0xe403,0xe000-0xe007,0xdc00-0xdc03,0xd800-0xd807 irq 10 at device 
19.0 on pci0
ata2: at 0xd800 on atapci1
ata3: at 0xe000 on atapci1
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model Generic PS/2 mouse, device ID 0
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
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
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
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
pcm0: <Yamaha OPL-SAx> at port 
0x220-0x22f,0x530-0x537,0x388-0x38b,0x330-0x331,0x370-0x371 irq 5 drq 0,1 on isa0
unknown: <PNP0303> can't assign resources
unknown: <PNP0f13> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0700> can't assign resources
unknown: <PNP0400> can't assign resources
unknown: <PNP0501> can't assign resources
ad0: 6149MB <QUANTUM FIREBALL CR6.4A> [13328/15/63] at ata0-master UDMA33
Mounting root from ufs:/dev/ad0s1a
IP packet filtering initialized, divert disabled, rule-based forwarding disabled, 
default to deny, logging disabled
pcm0: hwptr went backwards 1876 -> 1656
pcm0: hwptr went backwards 1724 -> 1616
pcm0: hwptr went backwards 3896 -> 3720

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