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Old 01-16-2008, 02:08 PM   #1
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imbalanced loading of core 2 duo processors

i've been wondering for a while now but hadnt had plenty of time to look it through thoroughly, but a quick search within didn't bring up any matches.

still i was just deleting (for console using rm) a huge folder and decided to check the load balancing between the 2 processors. OS is Slackware Linux 11.0 and i used the KSysGuard(performance monitor) to check the individual system and user loads for each one of the cpu's.

system load for cpu 0 would be running at approx 85%, while
system load for cpu 1 would be at 0-1%...

user load for cpu0 would jump between 0-25%, while
user laod for cpu1 would remain at 0 ....

cat /proc/interrupts returns smth rather irritating - cpu1 is hardly serving any interrupts! (look for the zero's after the comma - they are the cpu1 column but dont appear in table form unfortunately. also what is LOC?)
0: 1686389743, 0 IO-APIC-edge timer
1: 10589, 0 IO-APIC-edge i8042
4: 124483213, 0 IO-APIC-edge serial
6: 3, 0 IO-APIC-edge floppy
7: 0, 0 IO-APIC-edge parport0
8: 3, 0 IO-APIC-edge rtc
9: 0, 0 IO-APIC-fasteoi acpi
12: 333080, 0 IO-APIC-edge i8042
16: 219, 0 IO-APIC-fasteoi ohci1394, ehci_hcd:usb1, libata, uhci_hcd:usb7
17: 515061235, 0 IO-APIC-fasteoi uhci_hcd:usb3, nvidia
18: 0, 0 IO-APIC-fasteoi libata
19: 145675115, 0 IO-APIC-fasteoi uhci_hcd:usb6, eth0
20: 0, 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
21: 0, 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 228413, 0 IO-APIC-fasteoi HDA Intel
23: 6310, 0 IO-APIC-fasteoi ide2, ide3
219: 31157489, 0 PCI-MSI-edge libata
NMI: 0, 0
LOC: 1670444893, 1670444895
ERR: 0,
MIS: 0,

i know this matter about the interrupts has been brought up again... but with no solution at the time...

still should i be worried abt smth in my kernel? (its a custom
or rm is not thread friendly by nature?

any pointers to read smth (a guide) or any experience on the matter would be highly appreciated!
thank you

Last edited by nass; 01-16-2008 at 02:15 PM.
Old 01-16-2008, 02:31 PM   #2
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Comes up occasionally - have a look at this thread for example.
Old 01-16-2008, 04:16 PM   #3
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Normally. Pretty much once the app starts it stays with the cpu. Then the next call would hit the other but if a small app then not very cpu intense. If you really want to see both used then compile a kernel like you did but add the -j4 option to the make command.
make -j4

This will get 2 compiles of line ready one for each pcu and get 2 more ready once one of the cpus completes its step.

Old 01-18-2008, 05:32 PM   #4
Registered: Apr 2006
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well it shouldn't be necessary to require the -j4 to see the 2cpu processing interrupts... right? i mean its stuck at all 0's... that cant be fair loading...

then the -j4 option raises the amount of simultaneous jobs that can be run... but whats the drawback?...

and whats the point of choosing a core 2 duo cpu from the kernel's menuconfig if i still need this low level -j4 anabling?????

any intel forums that u may know of and i can right to ???


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