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This repository was archived by the owner on Sep 8, 2020. It is now read-only.
ZFS buffer/cache is counted under used memory #44
Description
I'm running zfsonlinux and htop is counting the ZFS ARC (memory) cache under normal used memory.
This is because ZFS doesn't use normal Linux memory cache but it's own version.
It would be useful if htop could detect if ZFS is running (maybe checking for /dev/zfs) and in that case show the memory used by ZFS cache in a different colour or maybe joined with the normal buffers/cache.
ARC used memory can be checked in /proc/spl/kstat/zfs/arcstats (size):
# grep ^size /proc/spl/kstat/zfs/arcstats
size 4 3533162592
Reacted by Romina K S, Corin Lawson, Felix Geyer and Maxime Guerreiro
Activity
hishamhm commentedon Apr 21, 2014
But does it behave like normal Linux memory cache? (ie, is it a kernelspace cache and if other programs need the memory does it relinquish it?)
borutmrak commentedon Apr 22, 2014
Yes, it does.
The limits for the cache are set in /sys/module/zfs/parameters/zfs_arc_max and /sys/module/zfs/parameters/zfs_arc_min, so there might be a minimum amount that is always in use, but the default is 0.
flaviut commentedon Jun 8, 2018
It looks like ARC space is considered correctly on FreeBSD, but not Linux.
Is this bug something you're willing to re-open?
xornet-sl commentedon Jun 14, 2019
@hishamhm Please, could you consider adding this feature for linux?
It would be great if I could see ARC statistics by different color in memory bar and as a different counter!
It would be very useful feature!
Harvie commentedon Jan 3, 2020
This is still a problem. Can you please take a look at it?