Hi
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
Symptoms are that typing in a terminal stops for a second or two every few minutes (at irregular intervals). Sometimes the pause is longer than other times. You can still move the windows around.
Active pings to other hosts also pause but eventually write the expected output as if nothing had happened - normal ping times, no lost pings.
I've done a lot of tests and think I've eliminated network hangups to the nis server and home disk hang ups (home disk are local but looked up over NIS).
Everything works as normal in an XFCE session, its KDE thats affected.
It seems that konsole and emacs i/o thats paused. Probably other termianls/editors would pause too but I haven't tried them. BBC news channel also goes buffering for a moment, but with the spinning symbol.
There were no obvious KDE updates last night, just a handful of other packages.
Anyone else seeing this kind of behaviour?
Thanks
Roderick Johnstone
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
Symptoms are that typing in a terminal stops for a second or two every few minutes (at irregular intervals). Sometimes the pause is longer than other times. You can still move the windows around.
Active pings to other hosts also pause but eventually write the expected output as if nothing had happened - normal ping times, no lost pings.
I've done a lot of tests and think I've eliminated network hangups to the nis server and home disk hang ups (home disk are local but looked up over NIS).
Everything works as normal in an XFCE session, its KDE thats affected.
It seems that konsole and emacs i/o thats paused. Probably other termianls/editors would pause too but I haven't tried them. BBC news channel also goes buffering for a moment, but with the spinning symbol.
There were no obvious KDE updates last night, just a handful of other packages.
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
Just right now I was unable to type into this message for a short period. I'd hit a key and it would take a couple of seconds for the character to appear. Now it it fine.
Also, sometimes I'll switch to a different tab in Chrome and nothing will happen. I'll stare at the screen, nothing. Then, I switch to a different virtual desktop and notice that in the systray the Chrome entry has changed names to the title of the tab I was switching to. Go back to Chrome and everything is back to normal.
Very annoying and no idea how to diagnose the issue.
On Wed, 1 Jul 2015 05:24:35 +0800 Ed Greshko ed.greshko@greshko.com wrote:
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
[snip]
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
[snip]
Very annoying and no idea how to diagnose the issue.
I'm yet to install F22, but just as an idea --- can you arrange to see what is the output of top and iotop during the pause (if any)?
That's just to eliminate any cpu and hd hangs due to some buffer flushings or such...
Also, some other shot-in-the-dark ideas: is it just certain apps that get stuck, like konsole? What if you open konsole and xterm side by side, and start ping in both --- do they both get stuck? Does konsole suffer when running under XFCE? Did you disable/enable desktop effects in KDE?
Experimenting in this way can at least help localize the problem to a certain set of apps or something, I guess...
I'm delaying the installation of F22 precisely due to these kind of quirks, it seems that there are a bit too many of them in the new KDE.
HTH, :-) Marko
On 30/06/15 23:01, Marko Vojinovic wrote:
On Wed, 1 Jul 2015 05:24:35 +0800 Ed Greshko ed.greshko@greshko.com wrote:
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
[snip]
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
[snip]
Very annoying and no idea how to diagnose the issue.
I'm yet to install F22, but just as an idea --- can you arrange to see what is the output of top and iotop during the pause (if any)?
That's just to eliminate any cpu and hd hangs due to some buffer flushings or such...
Also, some other shot-in-the-dark ideas: is it just certain apps that get stuck, like konsole? What if you open konsole and xterm side by side, and start ping in both --- do they both get stuck?
Marko
We ran this test. The pings continue normally in xterm but not in konsole where the output gets hung up for a few seconds.
Will try your other tests in due course.
Roderick
On 30/06/15 23:01, Marko Vojinovic wrote:
On Wed, 1 Jul 2015 05:24:35 +0800 Ed Greshko ed.greshko@greshko.com wrote:
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
[snip]
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
[snip]
Very annoying and no idea how to diagnose the issue.
I'm yet to install F22, but just as an idea --- can you arrange to see what is the output of top and iotop during the pause (if any)?
That's just to eliminate any cpu and hd hangs due to some buffer flushings or such...
Nothing obviously different about top or iotop (which I ran from an xterm) during pauses.
Roderick
On 30/06/15 23:01, Marko Vojinovic wrote:
On Wed, 1 Jul 2015 05:24:35 +0800 Ed Greshko ed.greshko@greshko.com wrote:
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
[snip]
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
[snip]
Very annoying and no idea how to diagnose the issue.
I'm yet to install F22, but just as an idea --- can you arrange to see what is the output of top and iotop during the pause (if any)?
That's just to eliminate any cpu and hd hangs due to some buffer flushings or such...
Also, some other shot-in-the-dark ideas: is it just certain apps that get stuck, like konsole? What if you open konsole and xterm side by side, and start ping in both --- do they both get stuck? Does konsole suffer when running under XFCE? Did you disable/enable desktop effects in KDE?
So, konsole gets stuck when running in xfce too.
Roderick
On 30/06/15 22:24, Ed Greshko wrote:
On 06/30/15 23:30, Roderick Johnstone wrote:
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
Symptoms are that typing in a terminal stops for a second or two every few minutes (at irregular intervals). Sometimes the pause is longer than other times. You can still move the windows around.
Active pings to other hosts also pause but eventually write the expected output as if nothing had happened - normal ping times, no lost pings.
I've done a lot of tests and think I've eliminated network hangups to the nis server and home disk hang ups (home disk are local but looked up over NIS).
Everything works as normal in an XFCE session, its KDE thats affected.
It seems that konsole and emacs i/o thats paused. Probably other termianls/editors would pause too but I haven't tried them. BBC news channel also goes buffering for a moment, but with the spinning symbol.
There were no obvious KDE updates last night, just a handful of other packages.
Anyone else seeing this kind of behaviour?
Sadly, yes. And no idea how to track it down.
Just right now I was unable to type into this message for a short period. I'd hit a key and it would take a couple of seconds for the character to appear. Now it it fine.
Also, sometimes I'll switch to a different tab in Chrome and nothing will happen. I'll stare at the screen, nothing. Then, I switch to a different virtual desktop and notice that in the systray the Chrome entry has changed names to the title of the tab I was switching to. Go back to Chrome and everything is back to normal.
Very annoying and no idea how to diagnose the issue.
Ed
Thats really good news, in a sense!
Of course, I would rather there was no problem, but knowing that I'm not on my own with this is helpful.
I'll change my focus from checking network infrastructure and servers and concentrate on some of the ideas that Marko suggested.
The symptoms you describe are exactly what I'm seeing. When did they start for you?
Thanks
Roderick
On 07/01/15 17:02, Roderick Johnstone wrote:
I'll change my focus from checking network infrastructure and servers and concentrate on some of the ideas that Marko suggested.
The symptoms you describe are exactly what I'm seeing. When did they start for you?
It is rather difficult for me to pinpoint a time. I did a fedup to F22 from F21 on June 16. After that I was dealing with "fallout" from the upgrade. Settings not being migrated, problems with konsole cut/paste, and plasma-shell freezes that turn out to be related to my preferred desktop theme. And, I was distracted by second F22 system and problems with rebooting when NFS mounts and Wifi are involved.
If I had to pick when I first started to notice it I'd say 5 to 7 days ago? Like yourself, I thought maybe it was just me. :-) The fact that it is intermittent and no way to predict or force a episode is frustrating.
I know what Marko is suggesting and will see if I can collect some information but with my luck by the time I start to collect the info between the sputters of the system the symptoms will go away. :-(
On 30/06/15 16:30, Roderick Johnstone wrote:
Hi
Since this morning, me and my users have been seeing pauses in our KDE sessions on F22.
Symptoms are that typing in a terminal stops for a second or two every few minutes (at irregular intervals). Sometimes the pause is longer than other times. You can still move the windows around.
Active pings to other hosts also pause but eventually write the expected output as if nothing had happened - normal ping times, no lost pings.
I've done a lot of tests and think I've eliminated network hangups to the nis server and home disk hang ups (home disk are local but looked up over NIS).
Everything works as normal in an XFCE session, its KDE thats affected.
It seems that konsole and emacs i/o thats paused. Probably other termianls/editors would pause too but I haven't tried them. BBC news channel also goes buffering for a moment, but with the spinning symbol.
There were no obvious KDE updates last night, just a handful of other packages.
Anyone else seeing this kind of behaviour?
Thanks
Roderick Johnstone
Reported at https://bugzilla.redhat.com/show_bug.cgi?id=1238707
Roderick