Public bug reported:
The plugin calculates the memory usage on Linux as (MemTotal -
(MemFree+Buffers+Cached)). This is not quite correct since:
* Shared memory (Shmem in /proc/meminfo) is contained in the "cached" memory
figure yet not reclaimable in most cases
* SReclaimable is slab memory that may be reclaimed in principle
So a much more realistic figure for the actual memory usage is (Total -
(Free+Buffers+Cached-Shmem+SReclaimable)). With the current (old)
setting the plugin displays a memory usage that is far too low for
systems that run applications with significant shared memory usage - a
prominent example would be virtual machines running in VMware player /
workstation.
In principle one would also need to subtract HugePages_Rsvd but since
this is mostly used on servers with big databases it's probably not such
a big issue for desktop systems.
This issue should most likely be fixed upstream.
Package: xfce4-systemload-plugin
Package version: 1:1.1.1-1ubuntu2 (but issue is present in Ubuntu 15.10 as well)
Release: Ubuntu 14.04.4 LTS
** Affects: xfce4-systemload-plugin (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "proof of concept patch for fixing the issue"
https://bugs.launchpad.net/bugs/1547918/+attachment/4576691/+files/xfce4-systemload-plugin-1.1.1-usedmem.patch
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https://bugs.launchpad.net/bugs/1547918
Title:
Plugin calculates free memory usage on Linux incorrectly
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