Re: [X2Go-User] x2goserver causes increase in ksoftirqd/x CPU usage
On 02.04.2015 04:09 PM, Rett Walters wrote: Yes - your right its the systemd unit called x2goserver, and it does appear to just start x2gocleansessions script. I will do some testing with older kernels to see if the problem is still present. This may look sort-of related: http://www.spinics.net/lists/kernel/msg1937202.html But that patch was included in 3.19.1 -- so if that patch was fixing the regression, you shouldn't see it on your Sabertooth machine (3.19.2) anymore. Maybe x2gocleansessions is polling too often (although it really looks more like a kernel issue than a issue with x2gocleansessions.) The polling was lowered to every 2 seconds two years ago: http://code.x2go.org/gitweb?p=x2goserver.git;a=commitdiff;h=dd176a90d04b64e Maybe changing this back to 5 seconds behaves better on your system? That may have consequences I'm unable to foresee, though. In any case, this problem should be reported to the Linux Kernel project. Maybe there are other instances of this issue. Mihai signature.asc Description: OpenPGP digital signature ___ x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user
Re: [X2Go-User] trouble connecting to server
On 02.04.2015 11:29 PM, Michael Stauffer wrote: Doh! OK I tried uninstalling gnome 3.10 so I could put an earlier version on. It's not working easily though. Im just going to start over with centos 6.6 and that should work out of the box if I understand right, since it uses gnome 2. IIRC, yes. But why not use CentOS 7 and for instance XFCE? Mihai smime.p7s Description: S/MIME Cryptographic Signature ___ x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user
Re: [X2Go-User] trouble connecting to server
Or Mate works well with Centos 7. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874. On Thu, 2 Apr 2015, Mihai Moldovan wrote: Date: Thu, 02 Apr 2015 23:34:10 +0200 From: Mihai Moldovan io...@ionic.de To: Michael Stauffer mgsta...@gmail.com, x2go-user@lists.x2go.org x2go-user@lists.x2go.org Subject: Re: [X2Go-User] trouble connecting to server On 02.04.2015 11:29 PM, Michael Stauffer wrote: Doh! OK I tried uninstalling gnome 3.10 so I could put an earlier version on. It's not working easily though. Im just going to start over with centos 6.6 and that should work out of the box if I understand right, since it uses gnome 2. IIRC, yes. But why not use CentOS 7 and for instance XFCE? Mihai ___ x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user
[X2Go-User] Low Latency
On 04/02/2015 10:46 AM, Les Mikesell wrote: Someone recently posted on the x2go list that he had a problem with jerky videos playing remotely on Ubuntu, but solved it by installing a low latency kernel that was available as an alternative. That made me curious as to whether CentOS has an equivalent - or a way to build something similar. Les, I can help you with CentOS 6 kernels but I haven't been successful at installing a custom kernel on CentOS 7, for some reason after I update grub2 then try to boot, I get a pointer alignment error and can't even get the grub boot screen up. But I have been successful with CentOS 6 and can provide assistance if needed. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874. ___ x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user
Re: [X2Go-User] trouble connecting to server
On 02.04.2015 08:26 PM, Michael Stauffer wrote: On Wed, Apr 1, 2015 at 5:15 PM, Mihai Moldovan io...@ionic.de mailto:io...@ionic.de wrote: Oh, and that's the good bit -- but very weird bit. localhost cannot be resolved on your system. Have you ever edited /etc/hosts? What is its content? Normally, it should include at least the following entries: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost Which make localhost resolvable. Interesting. My Mac's /etc/hosts is empty. I've added the text you posted above. Great! Actually, that's pretty weird. Your /etc/hosts file should never be empty on OS X (or actually any other UNIX-based/like operating system.) May I suggest your system is somewhat hosed and you should investigate what happened? Maybe even reinstall OS X? That's just a personal suggestion and has nothing to do with X2Go, but a missing /etc/hosts file has me concerned about what else might be messed up with that system... now it's getting further along. I get a new black window opening up with the grey x2go graphic in it, but then I get a sad comput face with the message: Oh no! Something has gone wrong. A problem has occured and the system can't recover. Please log out and try again. [...] No need for a debug log here, the issue is clear. You're trying to start up GNOME 3. GNOME 3.10 and later are not compatible, older versions may be, but probably not. For more information, please take a look at: http://wiki.x2go.org/doku.php/doc:de-compat#compatibility_and_workarounds_depend_on_what_version Looking at the more detailed x2go server installation page on your site, I then ran this: yum install x2goserver-xsession Yes, x2goserver-xsession is recommended/required for full desktop sessions. I tried x2goclient with a terminal session instead of GNOME and briefly got what looks like an xterm terminal but then it closed. I won't post the debug output here since it's so large. That's another known bug with new versions of GNOME Terminal. In recent versions, the program is forking into background and X2Go Server can't track that it's running anymore. Instead, it assumes the program terminated and also terminates the session. We have a workaround for this, but I would rather like to rewrite the affected server script to fix stuff like this in a sane way. However, take a look at yet another feature of X2Go Client (et al): published applications. http://wiki.x2go.org/doku.php/wiki:advanced:published-applications In that mode, you will be able to start GNOME Terminal and it won't quit on you right after starting. [...] But running gnome-session from the command line over an ssh session gives the same sad computer error page I describe above. Should it work to do that? About the same issue there: newer GNOME versions require a (newer) GLX extension. I guess that doesn't work at all via ssh -X and nx-libs's GLX extension is too old. That's a side-issue of the stale NX technology we're using. Work is done on improving this situation, but it's not trivial and requires a lot of work, so don't hold your breath for GNOME = 3.10 or KDE = 5 support any time soon, sorry... Mihai signature.asc Description: OpenPGP digital signature ___ x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user
Re: [X2Go-User] Jerky Video Fixed
In my case the client is old and rather under powered so it probably benefited more than most would have. Not being familiar with the internals or characteristics of Amazon's cloud, no idea how much that may or may not help. Hard to say how much latency and jitter is introduced by various cloud components like packet distributors, etc. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874. On Thu, 2 Apr 2015, brian mullan wrote: Date: Thu, 2 Apr 2015 12:17:34 -0400 From: brian mullan bmullan.m...@gmail.com To: Robert Dinse nan...@eskimo.com Cc: x2go-user@lists.x2go.org x2go-user@lists.x2go.org Subject: Re: [X2Go-User] Jerky Video Fixed Robert Thanks for all of your information on the low latency kernel. I've used x2go for several years and one use-case I've had was to install the x2go server onto either Amazon's AWS EC2 or on Digital Ocean to support remote desktops for K-12 schools that I do volunteer work for. Clients have always been a mix of Win7, Mac or Ubuntu linux. Really the only issue has been video streaming which for K-12 is important because alot of learning content online consists of video. In the past I've tried using larger compute instances (8-16 core) in those clouds thinking perhaps the video encoding/transmission load was the cause but that only improved things marginally. I tried higher bandwidth links... same marginal improvement. It didn't matter what client they used (mac, win7 or linux) the video content viewing results was more or less the same for each. That's why I am thinking maybe only the server-side may be required to have the low latency kernel?? I got them all so the streaming video (say youtube) wasn't awful but it wasn't the same as watching the video on a dedicated PC instead of thru the x2go virtual desktop. But i guess I never suspected the linux kernel introducing delay/jitter to the point of being the cause. It may take a while until I can get to it but I'll try and set up a test with one of those clouds and have the x2go server-side ubuntu utilize the low latency kernel you described and see what happens with each client. This would be great if that turns out to be the source of streaming video jerkiness for cloud based remote desktops. I'll post something to the x2go alias when I find out what happens. thanks again. Brian On Wed, Apr 1, 2015 at 5:55 PM, Robert Dinse nan...@eskimo.com wrote: In Ubuntu, they build low latency kernels and make them available as part of the distribution but not installed by default. On my workstation, which is an old Mac-Pro 1,1 with quad Xeon CPU's and 4 GB of RAM, I had Ubunto 14.04 installed then upgraded to 14.10. I had Wine installed and under Wine I ran WinAmp to play music. WinAmp sometimes skipped, and also when I upgraded to 14.10 which came with a 3.16.x kernel, I had issues with the Nvidia drivers for my old 7300 GT card. To solve those issues I ended up building a 3.18.9 kernel and built it with kernel preemption enabled, which is how Ubuntu builds their low latency kernels. That solved both my issues with Nvidia drivers and with WinAmp stuttering but it did not fix the issues of video being jerky over X2Go, and I had pretty much written that off to my Comcast connection anyway. But given how much smoother things went on my workstation, I decided to try installing the low latency kernel on the server and then tried watching some Youtube videos that had previously been jerky (audio okay but video jerky) and found that it made the video smooth. So my guess is you probably need it on both, but since I haven't tried it on the server only I can't say for sure. The kernel on the server isn't custom built, it's one of the low latency kernels provided by Ubuntu (I used synaptic package manager to select and install, rebooted, then removed the old). On the Mac I don't know. I had so much problems with X2Go on my Mac, even after installing the XQuartz server, that is one of the reasons I installed Ubuntu on it and stopped using MacOS. Got tired of the spinning beach ball, got tired of having zero games available. I liked the Dock but that's about it. Mac's approach of just throw enough hardware at it and it will be acceptable works if you have infinite money, I don't. With respect to Windows, I only have an old antique XP machine that I use for some games, don't really know how it would work with video over X2Go so can't answer that one. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ -_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site:
