[X2Go-User] Centos 7

[Robert Dinse]

      Actually I'm getting some lag occasionally to anywhere right now so it may 
just be my Comcrap cable internet acting up.  I'll check the video later 
tonight when traffic is lighter.

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On Fri, 3 Apr 2015, Robert Dinse wrote:

> Date: Fri, 3 Apr 2015 16:53:53 -0700 (PDT)
> From: Robert Dinse <nanook at eskimo.com>
> To: Mihai Moldovan <ionic at ionic.de>
> Cc: "x2go-user at lists.x2go.org" <x2go-user at lists.x2go.org>
> Subject: Re: [X2Go-User] Centos 7
> 
>
>     Thank you.  Duh I don't know how I could stare at that directory and not
> notice the missing extension.  Ugh.
>
>     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.
>
>     Still the performance with preemptive enabled is significantly better
> than without (server side).
>
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>   Knowledgeable human assistance, not telephone trees or script readers.
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>
> On Fri, 3 Apr 2015, Robert Dinse wrote:
>
>> Date: Fri, 3 Apr 2015 16:36:34 -0700 (PDT)
>> From: Robert Dinse <nanook at eskimo.com>
>> To: Mihai Moldovan <ionic at ionic.de>
>> Cc: "x2go-user at lists.x2go.org" <x2go-user at lists.x2go.org>
>> Subject: Re: [X2Go-User] Centos 7
>> 
>>
>>     Something still isn't right, missing the step to create initramfs,
>> so I added:
>>
>> 	mkinitrd initramfs-3.19.3-kg-1 3.19.3-kg-1
>>
>>     It creates it but when I run:
>>
>> 	grub2-mkconfig -o /boot/grub2/grub.cfg
>>
>>     It doesn't see it:
>> 
>> Generating grub configuration file ...
>> Found linux image: /boot/vmlinuz-3.19.3-kg-1
>> Found linux image: /boot/vmlinuz-3.19.3-1.el7.elrepo.x86_64
>> Found initrd image: /boot/initramfs-3.19.3-1.el7.elrepo.x86_64.img
>> Found linux image: /boot/vmlinuz-0-rescue-10a4840ccefb6d2f7accde9f4562308f
>> Found initrd image: 
>> /boot/initramfs-0-rescue-10a4840ccefb6d2f7accde9f4562308f.im
>>
>>     It finds the vmlinuz but not the initramfs.  Is there some conf file I
>> have to add that to?  Sorry not much experience with grub2 by hand, just 
>> the
>> old grub, and the make file does the right thing on the Debian based 
>> machines.
>>
>>     The kernel I'm trying to add is vmlinuz-3.19.3-kg-1
>>
>> 
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>> 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 00:54:26 +0200
>>> From: Mihai Moldovan <ionic at ionic.de>
>>> To: Robert Dinse <nanook at eskimo.com>,
>>>     "x2go-user at lists.x2go.org" <x2go-user at lists.x2go.org>
>>> Subject: Re: [X2Go-User] Centos 7
>>> 
>>> On 03.04.2015 09:38 PM, Robert Dinse wrote:
>>>>      Under CentOS 7
>>>>
>>>>      I've updated to the latest kernel provided in the El Repo
>>>> repository,
>>>>
>>>>          kernel-ml.x86_64   3.19.3-1.el7.elrepo   @elrepo-kernel
>>>>
>>>>      They have no version configured with pre-emption and this version
>>>> without
>>>> does not provide smooth video over x2go, very jerky and laggy like the
>>>> stock
>>>> kernel.
>>>>
>>>>      If I build a kernel from source from kernel.org, even using the same
>>>> conf, and install it:
>>>>
>>>>     make clean; make; make modules_install install
>>> 
>>> I wouldn't use "make install".
>>> 
>>> cp arch/x86_64/boot/bzImage /boot/vmlinuz-3.19.3
>>> cp System.map /boot/System.map-3.19.3
>>> 
>>> (or whatever the "real" version is, maybe even with the "localversion"
>>> string appended. You'll figure it out.
>>> The actual path may differ based on your architecture and the naming
>>> conventions of in /boot/.)
>>> /
>>> /Afterwards,
>>> 
>>> grub2-mkconfig -o /boot/grub2/grub.cfg
>>> 
>>> And you're all set.
>>> 
>>> Try rebooting and it should work just fine.
>>> 
>>> Do not try to update grub.
>>> 
>>> 
>>> 
>>> Mihai
>>> 
>>> 
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