High interrupt CPU usage in v2.7.1

tmb

I have the same issue. Running pfSense CE 2.7.2 in a VM on a XCP-ng host (8.2.1). Interrupt CPU usage is between 60-80%.

tmb

Some more data:

Top on the vm:

last pid: 23296;  load averages:  0.08,  0.14,  0.14                                                   up 0+18:46:31  10:20:03
286 threads:   2 running, 251 sleeping, 33 waiting
CPU:  0.0% user,  0.0% nice,  0.0% system, 84.0% interrupt, 16.0% idle
Mem: 85M Active, 142M Inact, 299M Wired, 56K Buf, 403M Free
ARC: 171M Total, 46M MFU, 118M MRU, 4096B Anon, 841K Header, 5776K Other
     143M Compressed, 278M Uncompressed, 1.94:1 Ratio
Swap: 1024M Total, 1024M Free

Top On the hypervisor:

top - 10:16:34 up 9 days, 12:45,  1 user,  load average: 651.11, 650.81, 649.76
Threads: 1763 total,   1 running, 1696 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.4 us,  0.7 sy,  0.0 ni, 98.6 id,  0.0 wa,  0.0 hi,  0.0 si,  0.3 st
KiB Mem :  1329412 total,    39032 free,   892192 used,   398188 buff/cache
KiB Swap:  1048572 total,   951548 free,    97024 used.   277052 avail Mem

vmstat -i

interrupt                          total       rate
irq1: atkbd0                        1094          0
irq15: ata1                        44975          1
irq23: uhci0                          20          0
cpu0:xen                        23137567        342
irq2102: xen_et0:c0              7093144        105
irq2103: xenstore0                  8039          0
irq2105: xbd0                     599431          9
irq2106: xn0                      925434         14
irq2107: xn0                      501940          7
irq2108: xn0                      437785          6
irq2109: xn0                     4301938         64
irq2110: xn1                     2861373         42
irq2111: xn1                     1348751         20
irq2112: xn1                     1813507         27
irq2113: xn1                     3541821         52
irq2114: xn2                       44963          1
irq2115: xn2                       15997          0
irq2116: xn2                       50798          1
irq2117: xn2                      133775          2
irq2121: xn3                           6          0
Total                           46862358        693

Raghnall

I am seeing the same thing, though it looks like it might be an accounting bug and not a real issue - see: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277231

Regardless, it does not seem to be related to the network cards or the version of Xen.
I see the same thing with only a physical Intel X520-DA2 passed through to the VM.
I also tested on XCP-ng 8.3-beta2 with Xen 4.13 as well as with Xen 4.17; all show the same issue.

tmb

@Raghnall Thank you for finding the bug report! I did search on the FreeBSD forums but couldn't find anything.

pfsense2023

Same thing here, running pfSense 2.7.2 on XCP-ng 8.3.0

It appears that this is just a bug on pfSense reporting itself because the VM stats show everything peacefully working.

cougarmaster

@pfsense2023

In top it shows high interrupt