tweak performance with kernelopts

mat74 · Tux's lil' helper Joined: 04 Jun 2004 Posts: 88

Hi!
I'm currently thinking about what I could do, to tweak my system's performance kernel-wise. I have 1 GB of ram, would disabling highmem make it faster? What about the stack size 4k/8k is there a difference? And what's with preempt? Good or bad for performance?Tell me what you do to tweak the last out of your systems! :twisted:

Uhm, here is a list of my harware:
cpu: PIV 2.4 B
ram: 1024MB DDR (266MHz)
hd: samsung ide 120GB

Mac Cloud · Posted: Thu Oct 28, 2004 2:40 pm Post subject:

you need preempt
smp if your proc is hyperthreading able
and a path called "low high memory" support because the limit of ram in no high memory support kenel is aroud 850 mo but high memory is too "big" for only 1go
look at "frame registers" too

And don't forget to edit /usr/src/linux/Makefile to enter your CFLAGS !
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blue.sca · Posted: Thu Oct 28, 2004 2:42 pm Post subject:

at first, patch it with any of those fancy kernel patchsets you can find here ;)
on your system, watch out for the 1gb_lowmem patch so you can fully use your 1gb ram without having high memory support enabled.
you can use nitro-sources (search for it). it shall be very good as far as i heard it. dunno, for me, its to overloaded. i use cko patchset with is based on ck patches and have all improvments i need.

//e just read this...

Mac Cloud · Posted: Thu Oct 28, 2004 2:49 pm Post subject:

Works perfectly for me sorry ... :oops:

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bennettp · Posted: Thu Oct 28, 2004 3:51 pm Post subject:

There's a fair amount of debate about preemption, and whether it's beneficial. I've been using it for about a year now, but I just disabled it in my latest kernel (2.6.9-gentoo-r1). Here's what I noticed:

* Solved a weird phenomenon when ripping dvds that prevented me from starting any other processes.
* Increased system stability, although I modified a few bios settings at the same time, which may be the cause of improved stability (set agp aperture and agp driving control to more conservative values).
* _Slight_ decrease in overall performance. This could be imagined. And, to be fair, my system has been under heavy load since I switched to the new kernel (current load avg: 4.30, 4.54, 4.79).

In short, the stock 2.6 kernel is good enough that you shouldn't need a preemptive kernel. But linux is all about choice!

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blue.sca · Posted: Thu Oct 28, 2004 8:50 pm Post subject: