On Tue, 29 Sep 2020 at 09:26, ToddAndMargo via users < users@lists.fedoraproject.org> wrote:
On 2020-09-28 05:49, Jonathan Billings wrote:
On Sat, Sep 26, 2020 at 04:11:33PM -0700, ToddAndMargo via users wrote:
FC 32, x64 Ext4 Xfce 4.14
Occasionally, my computers slows down. I have not been able to pin down why. Top shows very little memory usage.
A 1 hour, 12 minute dump (dump/restore) takes 15 hours when this happens. Pop up menus start to lag behind the mouse
I am trying to get around the reboot thing.
-T
A reboot ALWAYS fixes the issue.
Brendan Gregg has written several good talks and documents about various Linux performance measurement tools. You might want to see what the kernel is doing when you see sluggish behavior.
This is an excellent site. For starters, though, bpytop gives an overview that may help focus your investigation.
It does require some deep spelunking into the kernel internals, but it is actually quite amazing what the kernel has for monitoring its activities. I use it quite often to debug filesystem behavior, just poke around /sys/kernel/debug/tracing/events/.
Anything is particular to look at?
For starters: temperature spikes (numerous utilities, including bpytop) and disk errors (smartmontools). This doesn't appear to be a widespread problem, so you should think about malware, uncommon hardware, uncommon software.
If you have the resources to swap out the storage and start with a fresh install to see if the problem goes away that would help narrow the search.
https://www.kernel.org/doc/html/v5.8/trace/events.html
From my experience, as an end user providing feedback, the kernel developers really like it when you can point out a particular syscall from the trace output that is misbehaving.
Very true.