I would probably never have noticed it except for the strange noises produced when music is playing, and of course that is when it is the most annoying ;)
The issue occurs both in console and in X, and for both ULE and 4BSD. The problem was reproducible with USB keyboards only (ukbd); atkbd seems fine. It also occurs when numlockx is used to set numlock on or off without keyboard interaction.
Interestingly, if you add enough keyboards, the problem vanishes, which led me to kbdmux. Sure enough, removing device kbdmux from the kernel makes the problem go away (at the expensive of some functionality of course, but this is my current workaround).
Kernel config and dmesg are attached. As you may notice, I enabled kernel lock profiling for the purpose of troubleshooting this issue. I recorded the stats over a single occurance of the glitch. It seems to spend a vast amount of time waiting on giant as compared to any other lock. The output is almost 100k so I've omitted it for now; if it is of use to anyone let me know and I will certainly include it in reply.
Fraser
Copyright (c) 1992-2008 The FreeBSD Project.
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The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 7.0-RELEASE-p1 #30: Fri May 23 23:04:55 EST 2008
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/CUSTOM
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz (2669.34-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x10676 Stepping = 6
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x8e3fd<SSE3,RSVD2,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,<b19>>
AMD Features=0x20100000<NX,LM>
AMD Features2=0x1<LAHF>
Cores per package: 2
real memory = 2146304000 (2046 MB)
avail memory = 2094714880 (1997 MB)
ACPI APIC Table: <GBT GBTUACPI>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0: Changing APIC ID to 2
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <GBT GBTUACPI> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, 7fde0000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
cpu0: <ACPI CPU> on acpi0
acpi_perf0: <ACPI CPU Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 61a082006000820
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <PCI-PCI bridge> irq 16 at device 1.0 on pci0
pci1: <PCI bus> on pcib1
vgapci0: <VGA-compatible display> port 0xb000-0xb07f mem
0xf6000000-0xf6ffffff,0xe0000000-0xefffffff,0xf4000000-0xf5ffffff irq 16 at
device 0.0 on pci1
uhci0: <UHCI (generic) USB controller> port 0xe100-0xe11f irq 16 at device 26.0
on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <UHCI (generic) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <UHCI (generic) USB controller> port 0xe500-0xe51f irq 21 at device 26.1
on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <UHCI (generic) USB controller> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <UHCI (generic) USB controller> port 0xe000-0xe01f irq 18 at device 26.2
on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <UHCI (generic) USB controller> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xfa101000-0xfa1013ff irq 18 at
device 26.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <EHCI (generic) USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3
uhub3: 6 ports with 6 removable, self powered
pcib2: <ACPI PCI-PCI bridge> irq 16 at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> irq 19 at device 28.3 on pci0
pci3: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> irq 16 at device 28.4 on pci0
pci4: <ACPI PCI bus> on pcib4
re0: <RealTek 8168/8111B PCIe Gigabit Ethernet> port 0xc000-0xc0ff mem
0xf9000000-0xf9000fff irq 16 at device 0.0 on pci4
re0: Using 2 MSI messages
miibus0: <MII bus> on re0
rgephy0: <RTL8169S/8110S/8211B media interface> PHY 1 on miibus0
rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,
1000baseT-FDX, auto
re0: Ethernet address: 00:1d:7d:01:16:39
re0: [FILTER]
re0: [FILTER]
uhci3: <UHCI (generic) USB controller> port 0xe200-0xe21f irq 23 at device 29.0
on pci0
uhci3: [GIANT-LOCKED]
uhci3: [ITHREAD]
usb4: <UHCI (generic) USB controller> on uhci3
usb4: USB revision 1.0
uhub4: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb4
uhub4: 2 ports with 2 removable, self powered
uhci4: <UHCI (generic) USB controller> port 0xe300-0xe31f irq 19 at device 29.1
on pci0
uhci4: [GIANT-LOCKED]
uhci4: [ITHREAD]
usb5: <UHCI (generic) USB controller> on uhci4
usb5: USB revision 1.0
uhub5: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb5
uhub5: 2 ports with 2 removable, self powered
uhci5: <UHCI (generic) USB controller> port 0xe400-0xe41f irq 18 at device 29.2
on pci0
uhci5: [GIANT-LOCKED]
uhci5: [ITHREAD]
usb6: <UHCI (generic) USB controller> on uhci5
usb6: USB revision 1.0
uhub6: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb6
uhub6: 2 ports with 2 removable, self powered
ehci1: <EHCI (generic) USB 2.0 controller> mem 0xfa100000-0xfa1003ff irq 23 at
device 29.7 on pci0
ehci1: [GIANT-LOCKED]
ehci1: [ITHREAD]
usb7: EHCI version 1.0
usb7: companion controllers, 2 ports each: usb4 usb5 usb6
usb7: <EHCI (generic) USB 2.0 controller> on ehci1
usb7: USB revision 2.0
uhub7: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb7
uhub7: 6 ports with 6 removable, self powered
uhub8: <vendor 0x05ac product 0x1006, class 9/0, rev 2.00/95.15, addr 2> on
uhub7
uhub8: single transaction translator
device_attach: uhub8 attach returned 6
uhub7: port 6, set config at addr 2 failed
uhub7: device problem (TIMEOUT), disabling port 6
pcib5: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci5: <ACPI PCI bus> on pcib5
emu10kx0: <Creative Audigy 2 ZS [SB0350]> port 0xd000-0xd03f irq 18 at device
2.0 on pci5
emu10kx0: [ITHREAD]
pcm0: <EMU10Kx DSP front PCM interface> on emu10kx0
pcm0: <SigmaTel STAC9721/23 AC97 Codec>
pcm1: <EMU10Kx DSP rear PCM interface> on emu10kx0
pcm2: <EMU10Kx DSP center PCM interface> on emu10kx0
pcm3: <EMU10Kx DSP subwoofer PCM interface> on emu10kx0
pcm4: <EMU10Kx DSP side PCM interface> on emu10kx0
pci5: <input device> at device 2.1 (no driver attached)
pci5: <serial bus, FireWire> at device 2.2 (no driver attached)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH9 SATA300 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf000-0xf00f,0xfc00-0xfc0f at device 31.2
on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
atapci1: <Intel ICH9 SATA300 controller> port
0xe700-0xe707,0xe800-0xe803,0xe900-0xe907,0xea00-0xea03,0xeb00-0xeb0f,0xec00-0xec0f
irq 19 at device 31.5 on pci0
atapci1: [ITHREAD]
ata2: <ATA channel 0> on atapci1
ata2: [ITHREAD]
ata3: <ATA channel 1> on atapci1
ata3: [ITHREAD]
pmtimer0 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
ums0: <B16_b_02 USB-PS/2 Optical Mouse, class 0/0, rev 2.00/98.02, addr 2> on
uhub6
ums0: 8 buttons and Z dir.
Timecounters tick every 1.000 msec
ad0: 76319MB <Seagate ST380817AS 3.42> at ata0-master SATA150
ad1: 238475MB <Seagate ST3250410AS 3.AAC> at ata0-slave SATA150
SMP: AP CPU #1 Launched!
Trying to mount root from ufs:/dev/ad0s1a
unknown: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x48 0x00 0x01
cd0 at ata2 bus 0 target 0 lun 0
cd0: <PIONEER DVD-RW DVR-215 1.06> Removable CD-ROM SCSI-0 device
cd0: 3.300MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
uhub9: <Apple, Inc. Keyboard Hub, class 9/0, rev 2.00/95.15, addr 2> on uhub7
uhub9: single transaction translator
uhub9: 3 ports with 2 removable, bus powered
ukbd0: <Apple, Inc Apple Keyboard, class 0/0, rev 2.00/0.67, addr 3> on uhub9
kbd2 at ukbd0
uhid0: <Apple, Inc Apple Keyboard, class 0/0, rev 2.00/0.67, addr 3> on uhub9
# atomskbsd kernel configuration machine i386 cpu I686_CPU ident CUSTOM # 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 LOCK_PROFILING options SCHED_4BSD # 4BSD scheduler #options SCHED_ULE options PREEMPTION # Enable kernel thread preemption options INET # InterNETworking options INET6 # IPv6 communications protocols options SCTP # Stream Control Transmission Protocol options FFS # Berkeley Fast Filesystem options SOFTUPDATES # Enable FFS soft updates support options UFS_ACL # Support for access control lists options UFS_DIRHASH # Improve performance on big directories options UFS_GJOURNAL # Enable gjournal-based UFS journaling options MD_ROOT # MD is a potential root device options NFSCLIENT # Network Filesystem Client #options NFSSERVER # Network Filesystem Server #options NFS_ROOT # NFS usable as /, requires NFSCLIENT options MSDOSFS # MSDOS Filesystem options CD9660 # ISO 9660 Filesystem options PROCFS # Process filesystem (requires PSEUDOFS) options PSEUDOFS # Pseudo-filesystem framework options GEOM_PART_GPT # GUID Partition Tables. options GEOM_LABEL # Provides labelization options COMPAT_43TTY # BSD 4.3 TTY compat [KEEP THIS!] #options COMPAT_FREEBSD4 # Compatible with FreeBSD4 options COMPAT_FREEBSD5 # Compatible with FreeBSD5 options COMPAT_FREEBSD6 # Compatible with FreeBSD6 options SCSI_DELAY=5000 # Delay (in ms) before probing SCSI options KTRACE # ktrace(1) support options SYSVSHM # SYSV-style shared memory options SYSVMSG # SYSV-style message queues options SYSVSEM # SYSV-style semaphores options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions options KBD_INSTALL_CDEV # install a CDEV entry in /dev options ADAPTIVE_GIANT # Giant mutex is adaptive. options STOP_NMI # Stop CPUS using NMI instead of IPI options AUDIT # Security event auditing # To make an SMP kernel, the next two lines are needed options SMP device apic # I/O APIC # CPU frequency control device cpufreq # Bus support. device eisa device pci # ATA and ATAPI devices device ata device atadisk # ATA disk drives #device atapicd # ATAPI CDROM drives options ATA_STATIC_ID # Static device numbering # SCSI peripherals device scbus # SCSI bus (required for SCSI) device da # Direct Access (disks) device cd # CD device pass # Passthrough device (direct SCSI access) device atapicam # atkbdc0 controls both the keyboard and the PS/2 mouse device atkbdc # AT keyboard controller device atkbd # AT keyboard device psm # PS/2 mouse device kbdmux # keyboard multiplexer device vga # VGA video card driver device splash # Splash screen and screen saver support # syscons is the default console driver, resembling an SCO console device sc device agp # support several AGP chipsets # Power management support (see NOTES for more options) #device apm # Add suspend/resume support for the i8254. device pmtimer # 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 nfe # nVidia nForce MCP on-board Ethernet #device nve # nVidia nForce MCP on-board Ethernet Networking device re # RealTek 8139C+/8169/8169S/8110S #device rl # RealTek 8129/8139 #device sis # Silicon Integrated Systems SiS 900/SiS 7016 #device sk # SysKonnect SK-984x & SK-982x gigabit Ethernet # Pseudo devices. device loop # Network loopback device random # Entropy device device ether # Ethernet support #device sl # Kernel SLIP #device ppp # Kernel PPP device tun # Packet tunnel. device pty # Pseudo-ttys (telnet etc) device md # Memory "disks" #device gif # IPv6 and IPv4 tunneling #device faith # IPv6-to-IPv4 relaying (translation) device firmware # firmware assist module # The `bpf' device enables the Berkeley Packet Filter. # Be aware of the administrative consequences of enabling this! # Note that 'bpf' is required for DHCP. device bpf # Berkeley packet filter # USB support device uhci # UHCI PCI->USB interface device ohci # OHCI PCI->USB interface device ehci # EHCI PCI->USB interface (USB 2.0) device usb # USB Bus (required) #device udbp # USB Double Bulk Pipe devices device ugen # Generic device uhid # "Human Interface Devices" device ukbd # Keyboard device umass # Disks/Mass storage - Requires scbus and da device ums # Mouse # Sound support device sound device snd_emu10kx
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