On 2020-05-05 01:15, Robin Laing wrote:
> Hello
>
> I am trying to find out why kwin_x11 is using one core on my machine at and showing 94 to 99% in top. It isn't consistent as some times this doesn't occur. This is on F30.
>
> I set up another account on this machine for working at home and switch between the users being logged in at the same time.
>
> User A and B KDE sessions are running. New user C was created for work. I login user C and switch back to B or A and then one core goes to 94 to 99% load on kwin_x11 for user C.
>
> If I go to a VT terminal session , the kwin_x11 load disappears so it is related to both kwin sessions.
>
> If I use a tree listing, there is nothing listed under kwin-x11
>
> strace on the process provides
>
> ppoll([{fd=11, events=POLLIN}, {fd=9, events=POLLIN}, {fd=13, events=POLLIN}, {fd=6, events=POLLIN}, {fd=5, events=POLLIN}], 5, {tv_sec=0, tv_nsec=0}, NULL, 8) = 0 (Timeout)
>
> strace Summary of process calls.
>
> % time seconds usecs/call calls errors syscall
> ------ ----------- ----------- --------- --------- ----------------
> 100.00 0.713184 6 110466 ppoll
> ------ ----------- ----------- --------- --------- ----------------
> 100.00 0.713184 6 110466 total
>
> It does seem to be worse if I have any applications open such as Firefox or LibreOffice.
Do you know if this issue may have been coincidence with a kernel update? I had a similar issue, but
didn't investigate, on F31 with a 5.5 kernel. The problem cleared up after upgrade to F32 and a 5.6
kernel.
--
The key to getting good answers is to ask good questions.
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