Bug 672160 - High CPU utilization when the remote PC is slow to respond
Summary: High CPU utilization when the remote PC is slow to respond
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Fedora
Classification: Fedora
Component: remmina
Version: 14
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Christoph Wickert
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
: 715612 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-01-24 09:25 UTC by Davide Repetto
Modified: 2012-08-16 21:25 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-08-16 21:25:25 UTC
Type: ---


Attachments (Terms of Use)

Description Davide Repetto 2011-01-24 09:25:44 UTC
Description of problem:
High CPU utilization when the remote PC is slow to respond.
CPU usage bounces up to 100%.

Version-Release number of selected component (if applicable):
remmina-0.7.5-3.fc14.i686

How reproducible:
Always when the response of the remote system is slow either due to an hog or due to very slow connectivity.

Steps to Reproduce:
1. Connect to a desktop (win o linux is the same)
2. Make it really unresponsive allowing for multi-second delays
   (make it swap intensively and most systems will slow to a crawl)
3. Notice how remmina uses 100% cpu while waiting for the client response
  
Actual results:
HiGH CPU usage probably do to some "busy wait"

Expected results:
Very low CPU usage since remmina should be waiting passively

Additional info:
I'm using a 32 bit OS

Comment 1 Christoph Wickert 2011-04-02 08:41:12 UTC
Can you try the latest version of remmina form 
http://repos.fedorapeople.org/repos/cwickert/remmina/ ?

Comment 2 Davide Repetto 2011-04-11 10:54:39 UTC
I've used the new version of remmina for a while now (and BTW it is fantastic). though this particular problem is still there.

A new problem (due probably to changes in ultravnc) is that the chat and "disable remote imput" do not work with the latest versions of ultravnc (1.8.5/1.8.6).

Comment 3 Christoph Wickert 2011-06-23 22:58:25 UTC
(In reply to comment #2)
> I've used the new version of remmina for a while now (and BTW it is fantastic).
> though this particular problem is still there.

Confirmed, I just got another report in bug 715612.

> A new problem (due probably to changes in ultravnc) is that the chat and
> "disable remote imput" do not work with the latest versions of ultravnc
> (1.8.5/1.8.6).

I think both are extensions of UltraVNC that are not part of the VNC protocoll.

Comment 4 Alexey Larkov 2011-06-24 06:50:26 UTC
*** Bug 715612 has been marked as a duplicate of this bug. ***

Comment 5 Davide Repetto 2011-06-24 10:19:22 UTC
> I think both are extensions of UltraVNC that are not part of the VNC protocoll.

I concur. Chasing UltraVNC extensions to the VNC protocol is probably very hard, yet it would be fantastic to have those functions work with the current release too.
P.s. I didn't really look at the remmina code, but indeed this might be more of an upstream problem, since remmina relies on libraries for VNC support.

Comment 6 Christoph Wickert 2011-06-24 11:43:01 UTC
As for VNC we need to upgrade libvncserver to 0.9.8. Currently F15 has 0.9.7 which is not officially supported by remmina. I am still about to coordinate the upgrade because it requries several rebuilds of other packages.

Comment 7 Davide Repetto 2011-06-25 12:34:17 UTC
Yeah! And THAT is probably gonna be a pain... :(
Doing packaging right can be a chore and that's why I'm so grateful to you guys who put all the effort in it.

Thanks!!!

Comment 8 Jason Haar 2012-01-20 07:30:11 UTC
I use remmina to connect via RDP to Windows terminal servers, and see exactly this issue too. 

I normally trigger it when I am at home running RDP sessions, and then suspend and go to work. When I re-open, remmina immediately shoots up to 100% CPU - as obviously the old RDP sessions are not recoverable. I have to kill remmina to fix.

So I'd guess that means it isn't related to the VNC code?

Comment 9 Fedora End Of Life 2012-08-16 21:25:27 UTC
This message is a notice that Fedora 14 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 14. It is 
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of '14' have been closed as WONTFIX.

(Please note: Our normal process is to give advanced warning of this 
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