https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256217
Bug ID: 256217
Summary: [tcp] High system load because of interrupts with RACK
Product: Base System
Version: 13.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
After I enable RACK I notice high system load because of high interrupts.
I compile a kernel with these options:
makeoptions WITH_EXTRA_TCP_STACKS=1
options TCPHPTS
options RATELIMIT
I add in the /etc/sysctl.conf :
net.inet.tcp.functions_default=rack
and in /boot/loader.conf :
kern.eventtimer.timer=HPET
After I reboot the servers I notice 5% - 45% interrupts (some servers show more
and some less) using "top".
The issue happens with "kern.eventtimer.timer=LAPIC" too.
Then I disable RACK and switch back to LAPIC and after reboot "top" shows 0.0%
- 0.1% interrupts.
Switching to "net.inet.tcp.functions_default=freebsd" without reboot the
interrupts don't decrease.
Searching for similar issues I found this:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241958
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