Load when idl on stable

[Albert Shih]

 Le 04/06/2012 ? 06:22:34+0930, Matt Thyer a écrit
> 
Hi,

> Is this due to a high rate of interrupts ?

No idea ;-)

> i.e. can you see this with "systat -vm 1" with a large number in the "intr"
> field.

Well I don't known what you mean by «high rate», so I make a compraison
between my desktop and my laptop. 

On the laptop (where the load is always high) I got 
	~500- 650 total Interrupts with ~490-500 from hpet0 uhci

On my desktop (load is ~0) I got
	~340- 360 total Interrupts with 320-350 from hpet0 20


> 
> If yes, run "vmstat -i" to see what interrupt is being hit.
On my laptop (uptime ~ 1h): 

vmstat -i

interrupt                          total       rate
irq1: atkbd0                        7240          1
irq9: acpi0                            7          0
irq12: psm0                        44037         10
irq14: ata0                         6590          1
irq17: wpi0                       683770        155
irq18: atapci1                     15447          3
irq19: fwohci0                         2          0
irq20: hpet0 uhci0*              2888037        656
irq22: ehci0 uhci4                     2          0
irq256: hdac0                     270090         61
Total                            3915222        890

On my destkop (uptime 5 days)

interrupt                          total       rate
irq1: atkbd0                      239742          0
irq12: psm0                       999224          2
irq16: uhci0                     4062873          9
irq17: fwohci0++                       1          0
irq20: hpet0                   222779529        500
irq22: uhci2 ehci0                222967          0
irq24: vgapci0                    972589          2
irq256: hdac0                    9881473         22
irq257: bge0                     8422313         18
irq258: ahci0                    5744209         12
Total                          253324920        568

> 
> Then tell us what hardware is on that irq (from grep irq /var/run/dmesg.boot).


Here on the laptop: 

grep irq /var/run/dmesg.boot 

ioapic0 <Version 2.0> irqs 0-23 on motherboard
atrtc0: <AT realtime clock> port 0x70-0x71,0x72-0x77 irq 8 on acpi0
attimer0: <AT timer> port 0x40-0x43,0x50-0x53 irq 2 on acpi0
vgapci0: <VGA-compatible display> port 0xdf00-0xdf7f mem 0xf5000000-0xf5ffffff,0xe0000000-0xefffffff,0xf2000000-0xf3ffffff irq 16 at device 0.0 on pci1
uhci0: <Intel 82801H (ICH8) USB controller USB-D> port 0x6f20-0x6f3f irq 20 at device 26.0 on pci0
uhci1: <Intel 82801H (ICH8) USB controller USB-E> port 0x6f00-0x6f1f irq 21 at device 26.1 on pci0
ehci0: <Intel 82801H (ICH8) USB 2.0 controller USB2-B> mem 0xfed1c400-0xfed1c7ff irq 22 at device 26.7 on pci0
hdac0: <Intel 82801H HDA Controller> mem 0xf6ffc000-0xf6ffffff irq 21 at device 27.0 on pci0
wpi0: <Intel(R) PRO/Wireless 3945ABG> mem 0xf1fff000-0xf1ffffff irq 17 at device 0.0 on pci12
bge0: <Broadcom NetXtreme Gigabit Ethernet Controller, ASIC rev. 0x00a200>
mem 0xf1bf0000-0xf1bfffff irq 17 at device 0.0 on pci9
uhci2: <Intel 82801H (ICH8) USB controller USB-A> port 0x6f80-0x6f9f irq 20 at device 29.0 on pci0
uhci3: <Intel 82801H (ICH8) USB controller USB-B> port 0x6f60-0x6f7f irq 21 at device 29.1 on pci0
uhci4: <Intel 82801H (ICH8) USB controller USB-C> port 0x6f40-0x6f5f irq 22 at device 29.2 on pci0
ehci1: <Intel 82801H (ICH8) USB 2.0 controller USB2-A> mem 0xfed1c000-0xfed1c3ff irq 20 at device 29.7 on pci0
fwohci0: <1394 Open Host Controller Interface> mem 0xf1aff800-0xf1afffff irq 19 at device 1.0 on pci3
atapci0: <Intel ICH8M UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x6fa0-0x6faf irq 16 at device 31.1 on pci0
atapci1: <Intel ICH8M SATA300 controller> port 0x6eb0-0x6eb7,0x6eb8-0x6ebb,0x6ec0-0x6ec7,0x6ec8-0x6ecb,0x6ee0-0x6eef,0xeff0-0xefff irq 18 at device 31.2 on pci0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64,0x62,0x66 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0

Regards.

JAS
-- 
Albert SHIH
DIO bâtiment 15
Observatoire de Paris
5 Place Jules Janssen
92195 Meudon Cedex
Téléphone : 01 45 07 76 26/06 86 69 95 71
xmpp: jas at jabber.obspm.fr
Heure local/Local time:
mar 5 jui 2012 21:38:47 CEST