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 successfulat 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.
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On Fri, Apr 3, 2015 at 1:23 AM, Robert Dinse <nanook@eskimo.com> wrote:
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 successfulat 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.
[...]
Rather than having different builds of the kernel, RHEL has low latency performance tuning guides. These presumably apply to CentOS also:
Low Latency Performance Tuning Guide for Red Hat Enterprise Linux 6 https://access.redhat.com/articles/221153
Low Latency Performance Tuning for Red Hat Enterprise Linux 7 https://access.redhat.com/articles/1323793 (This one requires a RHEL subscription to access. It's a PDF like the RHEL6 guide.)
-Mike#2
They do not have the kernel built preemptively, this you can check bylooking at the config file they ship, I was not able to get rid of the stutter in the video without enabling this on my other boxes and building a kernel.
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On Fri, 3 Apr 2015, Michael DePaulo wrote:
Date: Fri, 3 Apr 2015 06:51:35 -0400 From: Michael DePaulo <mikedep333@gmail.com> To: Robert Dinse <nanook@eskimo.com> Cc: "x2go-user@lists.x2go.org" <x2go-user@lists.x2go.org> Subject: Re: [X2Go-User] Low Latency
On Fri, Apr 3, 2015 at 1:23 AM, Robert Dinse <nanook@eskimo.com> wrote:
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 successfulat 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.
[...]
Rather than having different builds of the kernel, RHEL has low latency performance tuning guides. These presumably apply to CentOS also:
Low Latency Performance Tuning Guide for Red Hat Enterprise Linux 6 https://access.redhat.com/articles/221153
Low Latency Performance Tuning for Red Hat Enterprise Linux 7 https://access.redhat.com/articles/1323793 (This one requires a RHEL subscription to access. It's a PDF like the RHEL6 guide.)
-Mike#2
On 03.04.2015 01:06 PM, Robert Dinse wrote:
They do not have the kernel built preemptively, this you cancheck by looking at the config file they ship, I was not able to get rid of the stutter in the video without enabling this on my other boxes and building a kernel.
Ref: http://serverfault.com/questions/268037/centos-5-realtime-patch
According to this, Scientific Linux may provide kernel-preemptive kernels.
Mihai
Scientific Linux is just a tad behind the curve at present, CentOSjust kicked out 7.1 (or 7 1533), SL is still on the original 7 release.
Still I need to figure out what is going on with Grub on this box,it works okay with the released kernels however the package is operating it, but make install is breaking it when compiling upstream kernels.
There is also a non-trivial advantage to going to 3.19.3 in terms ofI/O over 3.10.x. I read that kernels would be available from El Repo but haven't looked to see what is available there yet.
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On Fri, 3 Apr 2015, Mihai Moldovan wrote:
Date: Fri, 03 Apr 2015 18:07:03 +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] Low Latency
On 03.04.2015 01:06 PM, Robert Dinse wrote:
They do not have the kernel built preemptively, this you cancheck by looking at the config file they ship, I was not able to get rid of the stutter in the video without enabling this on my other boxes and building a kernel.
Ref: http://serverfault.com/questions/268037/centos-5-realtime-patch
According to this, Scientific Linux may provide kernel-preemptive kernels.
Mihai
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Michael DePaulo -
Mihai Moldovan -
Robert Dinse