0
votes
0answers
55 views

lm-sensors ubuntu 14.04 core voltages

I am trying to measure the core voltages of my cpu. I installed the lm-sensors, I ran the sensors-detect and I reply YES to all of the question. At the end of the sensors-detect I get: To load ...
2
votes
1answer
692 views

zram vs zswap vs zcache Ultimate guide: when to use which one

What the hell are they? how are they different (I've written my understanding in an answer below) In the Zswap system, when a page is evicted from the zswap to the actual swap is it stored in a ...
1
vote
1answer
67 views

Help with ram usage

I have a dual boot laptop with 512 MB RAM running Windows XP/Xubuntu. I try to load student.portal.chalmers.se (a huge bloat site) in Firefox. On XP, I can load the site without any swapping, but ...
0
votes
0answers
77 views

Dmesg - mounting takes longer in Lubuntu than in Debian

As an optimization freak, I have noticed for a long time (and many different kernel versions 3.8-3.12) that booting Lubuntu seems to delay 5 seconds when mounting the system partition. [ 4.993151] ...
0
votes
1answer
43 views

What causes Ubuntu to become randomly laggy and not fix until I restart?

I can use the computer for 2 hours without a problem, then when I do any random memory hungry action (Youtube Video, starting many application simultaneously) the computer becomes very slow and stays ...
0
votes
0answers
29 views

Does kernel influences the performance greatly?

I'm now testing performance of an armel filesystem and armhf filesystem, which are of the same distribution, but different kernels. The performance of the memory of the two filesystems differs a lot. ...
1
vote
2answers
3k views

How can I enable zswap?

Ubuntu 13.10's release notes mention that it includes Linux 3.11, which supports something called zswap: Zswap is a lightweight, write-behind compressed cache for swap pages. It takes pages that ...
0
votes
0answers
26 views

how to install linux-tools-3.5.0-030500

I installed kernel 3.5 from mainline using the procedure avaliable at http://ubuntuforums.org/showthread.php?p=11391743#post11391743 but when i tried to install perf, its asking for ...
0
votes
0answers
208 views

Ubuntu compatibility with new Apple Mac Pro hardware

Apple's new Mac Pro is being released this Fall. The hardware specs look great, but I also don't have enough understanding of hardware, hardware drivers, and linux kernel to make an educated guess as ...
0
votes
1answer
170 views

Why does CPU usage remain at 100% after running Mathematica 9?

I have installed Ubuntu 13.04 and Mathematica 9 on a Sony Vaio VPCEA36FG. When I run a program in Mathematica, CPU usage rises to 100%. This is a normal. But when Mathematica finishes computation, ...
1
vote
1answer
689 views

Advantages of alternative kernel

Recently I have seen an WebUpd8 article about an alternative kenrel to the stock Ubuntu kernel, the pf-kernel, that supposed increases performance. I am running Ubuntu 12.10 using kernel 3.5.0-30 ...
0
votes
3answers
833 views

building monolithic kernels will improve performace of the system ?

i am using ubuntu 12.04 . If I build monolithic kernels for device drivers i.e driver will have its own kernel as i understand , will it really improves system ...
2
votes
1answer
758 views

Ubuntu 12.04 - e1000e slow performance

I'm running Ubuntu 12.04 on a Thinkpad W510. lspci reports this ethernet controller 00:19.0 Ethernet controller: Intel Corporation 82577LM Gigabit Network Connection (rev 06) By default the ...
1
vote
1answer
3k views

How to get isolcpus kernel parameter working with Precise 12.04 amd64?

I've been testing this stuff trying to reserve some CPUs in a host with two Intel E5645 but I can't get it working for some reason. Steps I followed: Edit /etc/default/grub and added isolcpus=0,1 to ...
2
votes
1answer
172 views

Can I use kernel-seeds on top of Ubuntu kernels?

Former Gentoo user here. I'm trying to optimize the system by recompiling kernel specifically for my processor and disabling code I won't be using (to reduce memory consumption, improve speed etc.). ...
3
votes
1answer
447 views

How do I get Perfmon support for my kernel?

I would like to install perfmon for using performance monitoring events on my Ubuntu 10.04 LTS server machine. I have read that Ubuntu kernel 2.6 comes with perfmon support. However, as we can see ...
60
votes
6answers
10k views

How do we get this magic performance-boosting 200 line patch?

I read today on Phoronix that there is a 200 line patch to the Linux Kernel which dramatically improves desktop responsiveness. How can Ubuntu users get this in a way that's supported?
7
votes
1answer
1k views

What would be the recommended kernel configuration for a gaming machine?

I have read a lot of talk about how OpenSUSE is using a "Desktop" kernel. This kernel utilizes a 1000hz timer and full preemption among other things. The feature request here goes into more detail ...
4
votes
2answers
1k views

Why to use ordinary kernel if there's realtime one?

What are benefits of an ordinary Ubuntu kernel compared to realtime one? What are realtime kernel's tradeoffs?