Making a kernel patchset..

m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

I'm trying to make a patchset for personal use. So far I have got linux-2.6.12.tar.bz2, unpacked it, applied the realtime-preempt patch, mm2, patch-2.6.12.3, patch-2.6.12-ck3, genetic-as, genetic-io and genetic-lib for 2.6.12. All of the patches applied cleanly, but nothing appears for them in Kconfig. Can anyone help me out here?

EDIT: The reason they compiled cleanly and the menuconfig entries didn't appear was because I used --dry-run! oops! Now I get loads of reversed patch errors.

Tiger683 · Posted: Tue Jul 26, 2005 3:49 pm Post subject:

I don't believe you applied all the patches cleanly, reason?

ck3 + realtime-preempt = more rejects than you have ever dreamed of ...

i suggest you get yourself alot of kernel docs to read before trying to tackle it,
after you read them you also WILL know what you are doing....

Sorry to disappoint you here

T
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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Well, I actually got realtime_preempt to patch ontop of ck3 with 1 reject only, in asm-i386/string.h, or something like that. I just told it to leave that one out, although it will probably break stuff.

EDIT: Well, as I won't be able to use the staircase scheduler, is there any other good schedulers out there? Is the Zaphod CPU scheduler any good? Genetic-lib has a plugin for it, so that might be interesting.

Tiger683 · Posted: Tue Jul 26, 2005 4:11 pm Post subject:

Genetic scheduler is the worst you can choose for a desktop system...

AFAIK zaphod is also a server cpu-sched by design, so dont expect too much if you intend to go for it....
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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

So, can you give me any scheduler recommendations for a desktop system?

Tiger683 · Posted: Tue Jul 26, 2005 4:17 pm Post subject:

staircase and ingosched are the only reasonable ones atm.

also, nicksched is an option too, although for the new versions i'd recommend
you to email nick piggin, as he doesn't release the minor updates officially
(at least not the last time i checked, he mailed it to me some time after i contacted him,
shortly after he did some smp updates to it....). but let's be honest, none of these will make your desktop
a space shuttle, and also, except for the genetic cpu-sched, none will make your desktop
extremely lame or unusable.....
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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Ok, but what about the genetic anticipatory io sched, is that good? Or should I stick with CFQ? The reason I don't wanna use staircase is because it (probably) won't patch with realtime_preempt there, which I use. Or is it only the ck patch that causes this conflict?

Tiger683 · Posted: Tue Jul 26, 2005 4:28 pm Post subject:

now, let's put one thing clear:
realtime preemption is definitely not what you would like
to run on a computer which does something else than
professional audio processing or, well, nothing.

If you try to run a few applications simultaneously (or even emerge --sync AND compile)
or start 2 xsessions and play a game in one of them, you will get a hardlock or maybe just choppiness
leading to unusability in best case.

that's my two cents to RTP patch.
For "low latency desktop" mode of realtime preempt patch,
you will gain the same by applying the sched-* patches from mm tree,
which are already in love for example.

cheers

T
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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Ok, so it looks like I will scrap the rtp thing then. What io scheduler would you recommend for a desktop that will be either: compiling lots and lots of stuff, general desktop stuff, or if it's not any of those, gaming? I'm using the genetic-as scheduler now, and it seems good enough, but is there anything better? You said that genetic is the worst scheduler for desktop, but did you mean CPU or IO?

Tiger683 · Posted: Tue Jul 26, 2005 4:41 pm Post subject:

cpu ofcourse....

although, i assume genetic-as is worse than non-genetic as well, only the difference is not measurable...

i generally use anticipatory without genetics, although cfq-ts is also a very good choice.
probably thats why cfq-ts is now in mainline 2.6.13.....noticed it's absence in 2.6.13 ck release, right?

cheers

T
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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Hmmm, I can't get the staircase patch to patch cleanly on a stock 2.6.12 kernel. The staircase patch I am using is from 2.6.12-ck3.

Tiger683 · Posted: Tue Jul 26, 2005 4:47 pm Post subject:

HINT: series files aren't there just for fun

try patching all patches listed in it before staircase in the right order, dont forget the 2.6.12.x update patch

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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Ahhh, that worked

EDIT: I have the sched patches from mm2, and the series file, but because I am patching with stuff from ck3 as well, I don't know what order to patch them in.

predatorfreak · Posted: Tue Jul 26, 2005 9:20 pm Post subject:

Tiger683 · Posted: Tue Jul 26, 2005 10:00 pm Post subject:

Rather a small minus, and then you get exactly what i stated above....

so, your point is?
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predatorfreak · Posted: Tue Jul 26, 2005 10:04 pm Post subject:

Tiger683 · Posted: Tue Jul 26, 2005 10:05 pm Post subject:

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m0p · Apprentice Joined: 20 Jun 2005 Posts: 205 Location: en_GB

Can anyone recommend me some patches from 2.6.12-mm2 that will patch cleanly on top of 2.6.12-ck3? And does anyone know if the CFQ-TS IO scheduler is better than Genetic-anticipatory?

vipernicus · Posted: Thu Jul 28, 2005 6:29 pm Post subject:

PM me for a super secret patchset that will make a slow processor 52% faster, and a 5400 rpm drive act like a 20000rpm scsi!

J/K.

I've tried most of the schedulers, and so far these are the best combinations in my opinion.
1. staircase, cfq-ts, ext3 w/ dir_index enabled
2. ingosched + mm sched patches, cfq-ts, ext3 w/ dir_index enabled

Note: these work good on my machine, but may work bad on yours. there is not a single patch, or mixture of patches that will make your computer faster than ____mhz/ghz or your hard drive and filesystem faster. upgrading software is not like upgrading hardware. the best performance tweak ever is buying the top performance chip, the top performance ram, the best video card, etc.
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martin.k · Posted: Fri Jul 29, 2005 12:33 pm Post subject: