[Bug 256217] [tcp] High system load because of interrupts with RACK

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 28 May 2021 14:04:41 +0000
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256217

--- Comment #3 from Christos Chatzaras <chris_at_cretaforce.gr> ---
These are dedicated servers with no virtualisation.

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NIC:

em0: <Intel(R) PRO/1000 Network Connection> mem 0xf7000000-0xf701ffff irq 16 at
device 31.6 on pci0

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1) tcp_rack_load="YES" && "net.inet.tcp.functions_default=freebsd" && reboot =
problem does NOT exist

2) tcp_rack_load="NO" && "net.inet.tcp.functions_default=freebsd" && reboot =
problem does NOT exist

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3) tcp_rack_load="YES" && "net.inet.tcp.functions_default=rack" && reboot = the
problem EXIST.

Then if without reboot I "net.inet.tcp.functions_default=freebsd" the problem
still EXIST.

But when after I change to "freebsd" I run "kldunload -f tcp_rack" the problem
does NOT exist.

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Received on Fri May 28 2021 - 14:04:41 UTC

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