2.6.4-ck2 is out !

Message

gringo · Post by **gringo** » Fri Mar 26, 2004 4:03 pm

http://lkml.org/lkml/2004/3/26/110

staircase included!

ewan.paton · Post by **ewan.paton** » Fri Mar 26, 2004 4:12 pm

has anyone tested staircase yet, am i right in thinking its anouther disk access shedular or is it for the cpu

Jefklak · Post by **Jefklak** » Fri Mar 26, 2004 4:20 pm

Nice nice!
I'm going to use this one I think...

I'm trying to learn how that patch is built but I still don't get where the "-ck2" thing comes from. I mean, when using "uname -a" it'll say something like "Linux 2.6.4-ck2" > that HAS to be somewhere included in the patch but I have no clue where... Anyone?
More details

Epyon · Post by **Epyon** » Fri Mar 26, 2004 4:25 pm

Look at the Makefile. Specifically the EXTRAVERSION line.

gringo · Post by **gringo** » Fri Mar 26, 2004 5:04 pm

I patched rc2_mm2 with Con´s available patch and it runs fairly stable.
Had no problems with it so far.

*EDIT* New Reiser4 snapshot out too !
http://www.namesys.com/snapshots/2004.03.26/

Cerement · Post by **Cerement** » Sat Mar 27, 2004 7:54 am

Okay, anyone having a problem with this one?

Starts booting, makes it up to:
* ALSA Detected...
* Restoring Mixer Levels [ ok ]
and then just hangs ... never gets around to * Starting USB and PCI hotplugging

2.6.4-ck1 worked fine and 2.6.5-rc2-aa1 to -aa3 worked fine ...

feh

Jefklak · Post by **Jefklak** » Sat Mar 27, 2004 10:58 am

It could be udev & hotplug.
I'm trying them out right now ill let you know something.

gringo · Post by **gringo** » Sat Mar 27, 2004 11:45 am

I´m using udev stuff too and no troubles so far.
No idea what it could be...

Jefklak · Post by **Jefklak** » Sat Mar 27, 2004 1:23 pm

gringo wrote:I´m using udev stuff too and no troubles so far.
No idea what it could be...

Same here, works.
2.6.4-mm1 doesn't...
(I applied some custom patches but it's generally yust -ck2)

How do you use the staircase? Or is it set default as scheduler?
Something like elevator=stair or what?

darkless · Post by **darkless** » Sat Mar 27, 2004 3:21 pm

Staircase is the name of Con's scheduler policies, whereas as (anticipatory) or cfq (complete fair queue) are the names of the scheduler itself.

bssteph · Post by **bssteph** » Sat Mar 27, 2004 3:30 pm

I guess that is true... but not entirely a statement to solve the problem of confusion.

Staircase is a scheduler policy, yes. But it is for _processes_, not _disks_ (as the above post could be read to say). Quote Con:

Staircase scheduler?
This is a complete rewrite of the scheduler policy for normal tasks built on top of the O(1) scheduler. The aim was to make a scheduler that is interactive and responsive by design instead of modifying an existing design to make it interactive. 2.6.4-ck2 contains the first public release of this patch and so far has proven stable.

O(1) is the process scheduler. as and cfq are disk schedulers.

didl · Post by **didl** » Sat Mar 27, 2004 3:45 pm

Cerement wrote:Okay, anyone having a problem with this one?

Starts booting, makes it up to:
* ALSA Detected...
* Restoring Mixer Levels [ ok ]
and then just hangs ... never gets around to * Starting USB and PCI hotplugging
feh

Same here. However, hitting ^C a couple of times actually makes it
boot eventually. Problem seems to be in /sbin/rc, but I haven't
figured out what exactly causes it. The kernel itself runs fine.
It seems that the staircase patches cause this problem and after
backing them out, my system boots just fine.

darkless · Post by **darkless** » Sat Mar 27, 2004 3:45 pm

You are right, I should've made myself clearer to avoid confusion. Thanks for elaborating.

gringo · Post by **gringo** » Sat Mar 27, 2004 4:17 pm

Thanks for explain it! I was quite confused about this too...

Jefklak · Post by **Jefklak** » Sat Mar 27, 2004 4:26 pm

bssepth, so I can use "elevator=cfq" AND the staircase I(O)? No boot options or so needed for the first one? I also wonder wich patch those anticipatory or cfq shedulers are, or in wich kernel they are.

Let's say I'm using the -ck2 sources. (Vanilla patched). How can I use anticipatory then? Is there a patch or is it standard? And cfq? That would really clear things up for me

Thanks!

scaba · Post by **scaba** » Sat Mar 27, 2004 4:38 pm

How is the cfq scheduler set?
The cfq scheduler is enabled by default in -ck. If you do not wish to use the cfq I/O scheduler you will not benefit from the I/O priorities, but you can set it with the bootparam "elevator=as" or deadline.

http://members.optusnet.com.au/ckolivas/kernel/

bssteph · Post by **bssteph** » Sat Mar 27, 2004 4:43 pm

Jefklak wrote:bssepth, so I can use "elevator=cfq" AND the staircase I(O)? No boot options or so needed for the first one? I also wonder wich patch those anticipatory or cfq shedulers are, or in wich kernel they are.

Let's say I'm using the -ck2 sources. (Vanilla patched). How can I use anticipatory then? Is there a patch or is it standard? And cfq? That would really clear things up for me :) Thanks!

The kernel can have multiple disk schedulers compiled and ready for use at once. Examples are cfq, as, and deadline. These are selected with the elevator=x option at boot time.
as and deadline are standard right now and are in the vanilla kernel. as is the default. -ck2 adds cfq.

The kernel can only have one process scheduler under the current model. There is no way to switch them (other than get a different kernel) and therefore no need to choose what you want to use. Examples are:
O(1) - vanilla 2.6, -mm (mm includes some fixes that eventually make it to vanilla)
Nicksched - -love
O(1) + staircase - -ck

Hope this clears it up.

Jefklak · Post by **Jefklak** » Sat Mar 27, 2004 4:58 pm

I yust found a "cfq-4.patch" file in the broken-out -mm dir on kernel.org. It's the cfq sheduler, I didn't know it's in -ck2, So i already have it

Well thanks that indeed clears some things up.

I also heard Con's staircase breaks Nick's sheduler in -mm, so you won't be able to use those 2 at once...

dizzogg · Post by **dizzogg** » Wed Mar 31, 2004 7:22 pm

i think the staircase scheduler needs some more work, my system gets bogged down quite easily w/ it, music skips in rhythmbox, muine, which never happened before, but hey, I guess we're the guinea pigs... maybe I'll try out the aa-kernels..

ed0n · Post by **ed0n** » Wed Mar 31, 2004 8:01 pm

I tested ck few days ago, and I realized that in my p4 1.6ghz 512 mb ram desktop is faster with love-sources.

Cerement · Post by **Cerement** » Wed Mar 31, 2004 8:51 pm

dizzogg wrote:i think the staircase scheduler needs some more work, my system gets bogged down quite easily w/ it, music skips in rhythmbox, muine, which never happened before, but hey, I guess we're the guinea pigs... maybe I'll try out the aa-kernels..

Careful with the new -aa patchsets -- was getting all the symptoms of a slow memory leak with them, system ran great right after boot, but after a day, things all over the place started to gradually slow down, could watch each table cell being added when looking at the front page of forums ...

dizzogg · Post by **dizzogg** » Fri Apr 02, 2004 8:01 pm

Cerement wrote:
dizzogg wrote:i think the staircase scheduler needs some more work, my system gets bogged down quite easily w/ it, music skips in rhythmbox, muine, which never happened before, but hey, I guess we're the guinea pigs... maybe I'll try out the aa-kernels..
Careful with the new -aa patchsets -- was getting all the symptoms of a slow memory leak with them, system ran great right after boot, but after a day, things all over the place started to gradually slow down, could watch each table cell being added when looking at the front page of forums ...

thanks for the warning....

TenPin · Post by **TenPin** » Fri Apr 02, 2004 11:26 pm

ck2 works fine here but I think it might be slightly worse that ck1 for responsive ness. Hard to judge though.

Corky · Post by **Corky** » Sun Apr 04, 2004 6:03 am

TenPin wrote:ck2 works fine here but I think it might be slightly worse that ck1 for responsive ness. Hard to judge though.

Been running smoothly for me too, I'm not sure about less responsive than ck1, from my limited benchmarks its running about the same.

Jefklak · Post by **Jefklak** » Sun Apr 04, 2004 9:09 am

ck2 runs twice as good as the mm or love sources...
Now patching 2.6.5 @ ck2