Hi *,
I'm trying to debug a rather strange issue. I have two identical systems
with Debian Buster, Kernel 5.9 from Backports and the Intel X710 10GE
NIC using the i40e driver.
driver: i40e
version: 5.9.0-0.bpo.5-amd64
firmware-version: 8.15 0x80009613 1.2829.0
I want to use RSS thus I use the set_irq_affinity script from Intel like
this:
/usr/local/bin/set_irq_affinity 13-23,37-47 enp216s0f0
To assign this NIC to the NUMA Node 1 where it's attached.
So setting this, receiving traffic works fine and I see in
/proc/interrupts that the assignment works and for example cat
/proc/irq/305/smp_affinity
0000,00002000 is also correct.
On the other system I set the same and ensure that the smp_affinity is
correct via cat, but after 1-2s it's back to 0000,00000001 again. I can
set it to 2000 again but will be reset to 1 within 1-2 seconds. So I'm
now wondering what might trigger this, especially due to the fact that
those systems DON"T have irqbalance installed. I made sure that BIOS
version and settings are also the same (since some folks hinted that
X2APIC might be an issue).
If I set the enp216s0f0 interface down the smp_affinity stays. When I
set it up, I have the same reset issue again. I have like >50 other
systems that are all the same without that issue. But since I don't see
a hardware issue (SFP is also the same), I suspect that the i40e driver
is doing something or it's something odd within the traffic.
If anyone has an idea what might reset my irq smp_affinity setting that
would be very helpful.
Regards,
Andreas Herz
--
Andreas Herz
Cyber Security Expert
+49 151 20515125
andreas.h...@dcso.de
dcso.de
DCSO Deutsche Cyber-Sicherheitsorganisation GmbH • EUREF-Campus
22 • 10829 Berlin, Germany
Geschäftsführer: Andreas Kiefer, Sitz der Gesellschaft: Berlin,
Amtsgericht Charlottenburg HRB 172382
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