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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?
Nov
7
comment Uneven CPU core utilization
Asked a question on how to fix that: serverfault.com/questions/446173/…
Nov
7
asked CPU0 is swamped with eth1 interrupts
Nov
7
comment Uneven CPU core utilization
@DavidSchwartz: looks like you're right, thanks!
Nov
7
revised Uneven CPU core utilization
grr
Nov
7
answered Uneven CPU core utilization
Nov
7
comment Uneven CPU core utilization
@DavidSchwartz: How to check that?
Nov
6
comment Uneven CPU core utilization
@FINESEC: I'll check static pages and will update ticket. As for business logic — I believe that there should be tools to figure out what is going on without delving into the code. It is rather complex anyway. (That being said, it is single-threaded and no explicit synchronization stuff is used.)
Nov
6
comment Uneven CPU core utilization
It is 1am here, sorry. Maybe tomorrow. Meanwhile I've updated the question with htop screenshot.
Nov
6
revised Uneven CPU core utilization
minor wording tuning