What is the irqbalance and what was the reason for using it? <div class="gmail_quote">On Apr 9, 2015 8:09 AM, "Daniel J Blueman" <<a href="mailto:daniel@quora.org">daniel@quora.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Checked with Vivid beta on Intel i5 hardware, and it seems interrupt distribution doesn't change when I boot with irqbalance running [1], or after purging it and rebooting [2]. Finally, it can't second guess MSI interrupt setup better than the APIC driver and adds a unnecessary layer of 'intelligence'. I don't see any case common enough to warrant deploying it by default. Anyone against removing it? Dan -- [1] root@nuc:~# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 18 0 0 0 IR-IO-APIC-edge timer 1: 1 1 0 1 IR-IO-APIC-edge i8042 7: 9 0 0 0 IR-IO-APIC-edge 8: 0 0 0 1 IR-IO-APIC-edge rtc0 9: 3 0 0 0 IR-IO-APIC-fasteoi acpi 12: 1 2 1 0 IR-IO-APIC-edge i8042 23: 11 1 15 6 IR-IO-APIC 23-fasteoi ehci_hcd:usb3 40: 0 0 0 0 DMAR_MSI-edge dmar0 41: 0 0 0 0 DMAR_MSI-edge dmar1 42: 0 0 0 0 IR-PCI-MSI-edge PCIe PME 43: 0 0 0 0 IR-PCI-MSI-edge PCIe PME 44: 87 25 95 23 IR-PCI-MSI-edge xhci_hcd 45: 2740 4911 4405 14870 IR-PCI-MSI-edge 0000:00:1f.2 46: 10 10 2504 3 IR-PCI-MSI-edge eth0 47: 12 1 1 0 IR-PCI-MSI-edge mei_me 48: 8 14 3 1 IR-PCI-MSI-edge iwlwifi 49: 496 594 290 331 IR-PCI-MSI-edge i915 50: 197 80 4 39 IR-PCI-MSI-edge snd_hda_intel 51: 721 0 0 28 IR-PCI-MSI-edge snd_hda_intel NMI: 1 1 0 1 Non-maskable interrupts LOC: 30046 19983 13391 18318 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 1 1 0 1 Performance monitoring interrupts IWI: 0 0 0 0 IRQ work interrupts RTR: 2 0 0 0 APIC ICR read retries RES: 943 1130 618 693 Rescheduling interrupts CAL: 840 699 674 747 Function call interrupts TLB: 198 205 286 1241 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 4 4 4 4 Machine check polls HYP: 0 0 0 0 Hypervisor callback interrupts ERR: 9 MIS: 0 -- [2] root@nuc:~# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 20 0 0 0 IR-IO-APIC-edge timer 1: 1 0 1 1 IR-IO-APIC-edge i8042 7: 11 0 0 0 IR-IO-APIC-edge 8: 0 0 0 1 IR-IO-APIC-edge rtc0 9: 3 0 0 0 IR-IO-APIC-fasteoi acpi 12: 3 0 1 0 IR-IO-APIC-edge i8042 23: 15 10 10 0 IR-IO-APIC 23-fasteoi ehci_hcd:usb3 40: 0 0 0 0 DMAR_MSI-edge dmar0 41: 0 0 0 0 DMAR_MSI-edge dmar1 42: 0 0 0 0 IR-PCI-MSI-edge PCIe PME 43: 0 0 0 0 IR-PCI-MSI-edge PCIe PME 44: 48 9 98 11 IR-PCI-MSI-edge xhci_hcd 45: 3592 754 4633 1272 IR-PCI-MSI-edge 0000:00:1f.2 46: 37 23 89 13 IR-PCI-MSI-edge eth0 47: 14 0 0 0 IR-PCI-MSI-edge mei_me 48: 291 0 4 25 IR-PCI-MSI-edge snd_hda_intel 49: 12 16 6 0 IR-PCI-MSI-edge iwlwifi 50: 246 132 154 288 IR-PCI-MSI-edge i915 51: 25 673 13 42 IR-PCI-MSI-edge snd_hda_intel NMI: 0 0 0 0 Non-maskable interrupts LOC: 1041 1680 928 964 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 0 0 0 0 Performance monitoring interrupts IWI: 0 0 1 0 IRQ work interrupts RTR: 3 0 0 0 APIC ICR read retries RES: 374 517 311 305 Rescheduling interrupts CAL: 638 640 679 609 Function call interrupts TLB: 1628 93 49 110 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 2 2 2 2 Machine check polls HYP: 0 0 0 0 Hypervisor callback interrupts ERR: 11 MIS: 0 -- Daniel J Blueman -- Ubuntu-devel-discuss mailing list <a href="mailto:Ubuntu-devel-discuss@lists.ubuntu.com">Ubuntu-devel-discuss@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss</a> </blockquote></div>