https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238200
Bug ID: 238200
Summary: top(1)'s Swap In and Out numbers are twice as much
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
top has been reporting twice as high as actual transaction for swap-in and
swap-out.
Swap: 2048M Total, 201M Used, 1847M Free, 9% Inuse, 27M Out
In this line, top reported 27M Out. However, systat -vm only shows 13.5 MB
transaction for the same period to the device.
We need 3 terminals to observe:
term1 % top
term2 % systatm -vm 1
term3 % swapon <large-device>
term3 % mount -t tmpfs tmpfs /mnt/tmp
term3 % dd if=/dev/zero of=/mnt/tmp/large.txt bs=1M count=3000
Also Having 1 swap device makes easier to observe.
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