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Old 20th November 2021
rdikarlus rdikarlus is offline
Real Name: Carlosn
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Default huge use of memory

Hi all,

any idea why my NetBSD 9.2 server uses most of the memory ? it's like this all the time. The server is only used for backups and as a CIFS server.

I paste some screenshots.

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Size:  12.2 KB


Last edited by rdikarlus; 21st November 2021 at 07:07 PM. Reason: better understanding
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Old 29th November 2021
Sehnsucht94's Avatar
Sehnsucht94 Sehnsucht94 is offline
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NetBSD's UVM will by default use up to 50% of available memory for file I/O cache (as your screenshot shows) and release it no sooner should it be required by any process. This is not surprising per se for a file server. Is ram actually failing at being reclaimed? Is the system being slowed down or freezing?
You could try to change some of the default vm.* sysctl values in /etc/sysctl.conf, e.g. increase the memory to always be made available for anon pages, like:

# the minimum percentage of memory always (made) available for anonymous 
# pages. The default is 10.

# the maximum percentage of memory that will be reclaimed from other uses for
# file data cache. The default is 50.
Also, use vmstat(1) and top to better report memory statistics on NetBSD, as htop is not a native utility and is known to return frankly altered ram usage.
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