console getty uses 1.5% of CPU

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk>
Date: Wed, 07 Apr 2021 05:22:40 +0000
I have two 12.2-R systems where the serial console is attached to a terminal server.

When there are no TCP connections to the terminal server, getty soaks up 1.5% of the
CPU in the kernel (sleeping in "ttyin"), ktrace shows no system calls.

When a TCP connection is made to the terminal server, which raises the modem-handshake
on the DE-9 connector, the CPU usage stops.

Anybody else seeing something like this ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk_at_FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Received on Wed Apr 07 2021 - 03:22:50 UTC

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