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Hi all!
I recently heard about Irqbalance but I wonder if it makes sense to use this with a Core2Duo CPU to save power (it's a laptop) and maybe gain some perf?
What do you think about it?
Pc: Intel core i7, 8Gb RAM, Archlinux 64bits, Gnome 3
Laptop 1: Intel Core2Duo, 4Gb RAM, Archlinux 64bits, Gnome 3
Laptop 2: Intel P4 HT, 512Mb RAM, Archlinux 32 bits, Gnome 3 too
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Take a look:
cat /proc/interrupts
If your interrupts are already balanced across cores (which they most probably are), then irqbalance won't help.
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Indeed, cat /proc/interrupts shows:
CPU0 CPU1
0: 8291 8460 IO-APIC-edge timer
1: 117 106 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 159 163 IO-APIC-fasteoi acpi
12: 6912 6857 IO-APIC-edge i8042
16: 4 1 IO-APIC-fasteoi uhci_hcd:usb2, mmc0, firewire_ohci
18: 0 0 IO-APIC-fasteoi uhci_hcd:usb7
19: 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb4, uhci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
23: 43 48 IO-APIC-fasteoi uhci_hcd:usb5, ehci_hcd:usb8
44: 7534 7348 PCI-MSI-edge radeon
45: 6818 6768 PCI-MSI-edge ahci
46: 83 77 PCI-MSI-edge snd_hda_intel
47: 75 72 PCI-MSI-edge snd_hda_intel
48: 1 0 PCI-MSI-edge eth0
49: 4041 3928 PCI-MSI-edge iwlwifi
NMI: 1 1 Non-maskable interrupts
LOC: 11107 12559 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 1 1 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 4721 4737 Rescheduling interrupts
CAL: 59 37 Function call interrupts
TLB: 6376 2266 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 1 1 Machine check polls
ERR: 0
MIS: 0
So it seems it's correctly balanced
Pc: Intel core i7, 8Gb RAM, Archlinux 64bits, Gnome 3
Laptop 1: Intel Core2Duo, 4Gb RAM, Archlinux 64bits, Gnome 3
Laptop 2: Intel P4 HT, 512Mb RAM, Archlinux 32 bits, Gnome 3 too
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