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.
>
> http://brendangregg.com/linuxperf.html
>
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.