[X2Go-User] Centos 7

[Robert Dinse]

      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.

-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
  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 Sat, 4 Apr 2015, Mihai Moldovan wrote:

> Date: Sat, 04 Apr 2015 02:03:07 +0200
> From: Mihai Moldovan <ionic at ionic.de>
> To: Robert Dinse <nanook at eskimo.com>
> Cc: "x2go-user at lists.x2go.org" <x2go-user at 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 directory
>> and 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 only
>> preemptive 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 one
>> off 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
>
>