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Nov
12
revised How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
this is a PV domU
Nov
12
comment How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
Thanks, but, would it help or not is outside of the scope of this question. Your help is very welcome here: serverfault.com/questions/446173/… or here: serverfault.com/questions/446081/uneven-cpu-core-utilization
Nov
12
comment How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
PV. I'll update the question.
Nov
9
revised How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
looks like the fact that we're inside Xen may be important
Nov
9
comment How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
Note that irqbalance is running. Maybe I'm just doing it wrong?
Nov
9
revised How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
irqbalance is running
Nov
9
comment How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
Correct. I'll update the question.
Nov
9
comment How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
Does not work, see update to the question.
Nov
9
revised How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
added info on error
Nov
7
comment CPU0 is swamped with eth1 interrupts
I've got an impression that smp_affinity_list is not supported in 2.6. Also, I did try that in hex, actually... Anyway, moving this to a question I linked to — will try tomorrow.
Nov
7
comment CPU0 is swamped with eth1 interrupts
serverfault.com/questions/446304/…
Nov
7
asked How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?
Nov
7
comment CPU0 is swamped with eth1 interrupts
Erm. No, still can't change that. Can't figure out what is going on. Will ask a separate question for that.
Nov
7
comment CPU0 is swamped with eth1 interrupts
Nevermind that — I tried it on wrong machine with 4 cores instead of 8.
Nov
7
comment CPU0 is swamped with eth1 interrupts
BTW, I see /proc/irq/283/affinity_hint, but can't find proper docs for it. Can't this be related?
Nov
7
comment CPU0 is swamped with eth1 interrupts
echo $((2**8-1)) | sudo tee /proc/irq/283/smp_affinity gives me Input/output error (irqbalance is stopped).
Nov
7
comment CPU0 is swamped with eth1 interrupts
Disabling irqbalance (via ENABLED=0 in /etc/default/irqbalance) does not help. After reboot irqbalance is stop/waiting, but /proc/irq/283/smp_affinity is still 01.
Nov
7
comment CPU0 is swamped with eth1 interrupts
FYI: /proc/irq/283/smp_affinity has 01 in it now (nobody changed that stuff on this machine to the best of my knowledge — so this must be system default).
Nov
7
comment CPU0 is swamped with eth1 interrupts
irqbalance already is running. Maybe it is not configured correctly? How to check that?
Nov
7
comment CPU0 is swamped with eth1 interrupts
Bonus question: is there a way to lessen the number of interrupts from eth1?