Date: Fri, 28 May 2021 10:57:00 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 256217] [tcp] High system load because of interrupts with RACK Message-ID: <bug-256217-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256217 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: bugs@FreeBSD.org Reporter: chris@cretaforce.gr 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=3D1 options TCPHPTS options RATELIMIT I add in the /etc/sysctl.conf : net.inet.tcp.functions_default=3Drack and in /boot/loader.conf : kern.eventtimer.timer=3DHPET 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=3DLAPIC" 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=3Dfreebsd" without reboot the interrupts don't decrease. Searching for similar issues I found this: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D241958 --=20 You are receiving this mail because: You are the assignee for the bug.=
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