I built 3.19.3 kernels on Debian from kernel.org, they play the video fluidly, so it's not Canonical's patches making it work. But it may actually be okay on CentOS. Shortly after I posted the last post I started getting lag to everywhere so bad that there were 2-3 second delays in my keyboard echos. Comcast has occasional problems where I am (my servers are all in a co-location facility with good connectivity but I'm working out of my home with Comcast cable) and occasionally it gets laggy and drops packets. Usually between 8pm-10pm not in the afternoon but I guess today is special. So I will test again after the lag clears up.
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On Sat, 4 Apr 2015, Mihai Moldovan wrote:
Date: Sat, 04 Apr 2015 02:03:07 +0200 From: Mihai Moldovan <ionic@ionic.de> To: Robert Dinse <nanook@eskimo.com> Cc: "x2go-user@lists.x2go.org" <x2go-user@lists.x2go.org> Subject: Re: [X2Go-User] Centos 7
On 04.04.2015 01:53 AM, Robert Dinse wrote:
Thank you. Duh I don't know how I could stare at that directoryand not notice the missing extension. Ugh.
You're not alone, this stuff happens to me too... More often than I'd like.
Thank you for your help. The 3.19.3 kernel I built is not onlypreemptive but also stripped of most of the stuff I don't use. I also turn off most of the kernel hacking and profiling stuff since it adds a tiny bit of overhead.
It helped considerably over either the stock kernel or the oneoff of el repo (the el repo 3.19.3-ml kernel), however the video isn't 100% fluid.
With the el repo kernel I got around maybe 10 frames per second,with my custom kernel I get around 30 frames per second most of the time but there are occasional glitches where the video will freeze for maybe a third of a second.
Under Ubuntu, a kernel built the same way, the video is fluid.There must be something in CentOS eating more resources.
I wouldn't be sure about the "eating more resources" part. Unless something spikes in top/htop, maybe. But given you've tried with a rt kernel as provided by Ubuntu, there are multiple other things to consider:
- the Ubuntu kernel was patched by Canonical (most of the time quite heavily when comparing a vanilla kernel to a stock Ubuntu kernel)
- the Ubuntu kernel may *additionally* include other RT patches that are neither part of their stock, nor the vanilla kernel
- it may use different options from what you have
There's a good chance this influences what you're seeing.
If you really want to find out what leads to this differing behavior, you're in for a ride (and quite possibly a rather frustrating one, too.)
Mihai