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Date:      Sun, 4 Dec 2005 15:27:44 +0100
From:      GiZmen <gizmen@zion.vsip.pl>
To:        hackers@freebsd.org
Subject:   clock interrupts eating whole cpu
Message-ID:  <20051204142744.GA53154@blurp.pl>

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Hi,

yesterday i have noticed that my cpu is runnig on 100%.
And almost 100% is used on interrupts

CPU states:  0.0% user,  0.0% nice,  1.4% system, 98.6% interrupt,  0.0% idle

i tried to check what is going on.
I ran top and pressed S so i could see all processes:

  PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
   27 root        1 -32 -151     0K     8K RUN     62:48 67.72% swi4: clock
   29 root        1 -44 -163     0K     8K RUN     28:30 28.17% swi1: net
   11 root        1 171   52     0K     8K RUN      1:03  1.12% idle

I have noticed that clock is eating most free cpu time.
Net load is in normal because this is router for about 150 hosts.

Could any one tell me what is going on?

I am running FreeBSD 6.0-STABLE. i didnt have any problems like that before
with FreeBSD 6.0-BETA ,RC,RELEASE and even STABLE. This happend
yesterday or dwo days ago. I have downloaded newest src from cvsup and
recompiled kernel which took quite long time due cpu usage.

System is runnig postfix,mysql,apache2,dhcpd.

I have attached my kernel config.
I dont know where to look for problem. Please help me with this.


-- 
Best Regards:
		GiZmen

UNIX is user-friendly; it's just picky about its friends
UNIX is simple; it just takes a genius to understand its simplicity

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machine		i386
cpu         I686_CPU
ident		BLURP

makeoptions	COPTFLAGS="-O2 -pipe -funroll-loops -ffast-math -fno-builtin"
makeoptions	CONF_CFLAGS="-O2 -pipe -funroll-loops -ffast-math -fno-builtin"
#makeoptions DEBUG=-g

options		SCHED_4BSD
#options 	SCHED_ULE		# 4BSD scheduler
options     PREEMPTION      # Enable kernel thread preemption
options 	INET			# InterNETworking
options 	INET6			# IPv6 communications protocols
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 	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		NULLFS
options 	GEOM_GPT		# GUID Partition Tables.
options 	COMPAT_43		# Compatible with BSD 4.3 [KEEP THIS!]
options 	COMPAT_FREEBSD4		# Compatible with FreeBSD4
options     COMPAT_FREEBSD5     # Compatible with FreeBSD5
#options 	SCSI_DELAY=15000	# 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     SHMMAXPGS=4096
#options     SHMSEG=256
#options     SEMMNI=256
#options     SEMMNS=512
#options     SEMMNU=256
#options     SEMMAP=256
options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
#options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug
					# output.  Adds ~128k to driver.
#options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug
					# output.  Adds ~215k to driver.
options 	ADAPTIVE_GIANT		# Giant mutex is adaptive.

#device      apic            # I/O APIC

# Bus support.  Do not remove isa, even if you have no isa slots
device		isa
device		pci

# Floppy drives
#device		fdc

# ATA and ATAPI devices
device		ata
device		atadisk		# ATA disk drives
#device		ataraid		# ATA RAID drives
device		atapicd		# ATAPI CDROM drives
options 	ATA_STATIC_ID	# Static device numbering

# 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		vga		# VGA video card driver
device		sc
#device		agp		# support several AGP chipsets
device		npx

# Add suspend/resume support for the i8254.
device		pmtimer

#options         CPU_ENABLE_TCC
#options         VESA
options         GEOM_BDE                # Disk encryption.
options         ALTQ
#options         ALTQ_CBQ        # Class Bases Queueing
options         ALTQ_RED        # Random Early Drop
#options         ALTQ_RIO        # RED In/Out
options         ALTQ_HFSC       # Hierarchical Packet Scheduler
#options         ALTQ_CDNR       # Traffic conditioner
#options         ALTQ_PRIQ       # Priority Queueing

device          pf                      #PF OpenBSD packet-filter firewall
device          pflog                   #logging support interface for PF
device          pfsync                  #synchronization interface for PF
options         IPSTEALTH               #support for stealth forwarding
options         ACCEPT_FILTER_DATA
options         ACCEPT_FILTER_HTTP
options         TCP_DROP_SYNFIN         #drop TCP packets with SYN+FIN
options         BRIDGE
options         ZERO_COPY_SOCKETS
options         QUOTA                   #enable disk quotas
options         MAXCONS=5
options         MAC
options         SC_HISTORY_SIZE=5000
#options         SC_DISABLE_DDBKEY
#options         SC_DISABLE_REBOOT
#options         SC_TWOBUTTON_MOUSE
#options         CPU_SUSP_HLT
#options         MAC_BIBA
#options         MAC_BSDEXTENDED
options         HZ=1000
#device          sound
#options         INCLUDE_CONFIG_FILE     # Include this file in kernel
#options         HW_WDOG
#options         SW_WATCHDOG
options     	DEVICE_POLLING
options         CPU_ATHLON_SSE_HACK
#options         NETGRAPH

#options         KDB
#options         KDB_TRACE
#options         KDB_UNATTENDED
#options         DDB
#options         INVARIANTS
#options         INVARIANT_SUPPORT
#options         DIAGNOSTIC
#options         WITNESS

#options         CD9660_ICONV
#options         MSDOSFS_ICONV
#options         NTFS_ICONV
#options         UDF_ICONV

device		miibus		# MII bus support
#device		re		# RealTek 8139C+/8169/8169S/8110S
device		rl		# RealTek 8129/8139
#device		ed		# NE[12]000, SMC Ultra, 3c503, DS8390 cards
device      fxp
device      xl

# Pseudo devices.
device		loop		# Network loopback
device		mem		# Memory and kernel memory devices
device		io		# I/O device
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      snp             #Snoop device - to look at pty/vty/etc..

device		bpf		# Berkeley packet filter

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