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gringo
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ewan.paton
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Joined: 29 Jul 2003
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Location: glasgow, scotland
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 Posted: Fri Mar 26, 2004 4:12 pm Post subject: |
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has anyone tested staircase yet, am i right in thinking its anouther disk access shedular or is it for the cpu
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Jefklak
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Joined: 26 Oct 2003
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Location: Belgium
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| Posted: Fri Mar 26, 2004 4:20 pm Post subject: |
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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
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Epyon
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Joined: 11 Sep 2003
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Location: NJ, USA
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| Posted: Fri Mar 26, 2004 4:25 pm Post subject: |
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| Look at the Makefile. Specifically the EXTRAVERSION line. |
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gringo
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| Posted: Fri Mar 26, 2004 5:04 pm Post subject: |
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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/ |
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Cerement
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Joined: 14 Jun 2003
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| Posted: Sat Mar 27, 2004 7:54 am Post subject: |
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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 |
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Jefklak
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Joined: 26 Oct 2003
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| Posted: Sat Mar 27, 2004 10:58 am Post subject: |
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It could be udev & hotplug.
I'm trying them out right now ill let you know something.
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gringo
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| Posted: Sat Mar 27, 2004 11:45 am Post subject: |
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I´m using udev stuff too and no troubles so far.
No idea what it could be... |
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Jefklak
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| Posted: Sat Mar 27, 2004 1:23 pm Post subject: |
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| 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?
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darkless
n00b
Joined: 01 Jan 2004
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Location: Denmark
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| Posted: Sat Mar 27, 2004 3:21 pm Post subject: |
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Staircase is the name of Con's scheduler policies, whereas as (anticipatory) or cfq (complete fair queue) are the names of the scheduler itself.
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bssteph
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Joined: 26 Feb 2003
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Location: Wisconsin
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| Posted: Sat Mar 27, 2004 3:30 pm Post subject: |
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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:
| Quote: | 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. |
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didl
Retired Dev
Joined: 09 Sep 2003
Posts: 1106
Location: Pittsburgh, PA
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| Posted: Sat Mar 27, 2004 3:45 pm Post subject: |
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| 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. |
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darkless
n00b
Joined: 01 Jan 2004
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| Posted: Sat Mar 27, 2004 3:45 pm Post subject: |
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You are right, I should've made myself clearer to avoid confusion. Thanks for elaborating.
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gringo
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| Posted: Sat Mar 27, 2004 4:17 pm Post subject: |
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| Thanks for explain it! I was quite confused about this too... |
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Jefklak
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| Posted: Sat Mar 27, 2004 4:26 pm Post subject: |
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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!
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scaba
Apprentice
Joined: 10 Jan 2004
Posts: 252
Location: Zurich, Switzerland
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| Posted: Sat Mar 27, 2004 4:38 pm Post subject: |
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| Quote: | 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/
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bssteph
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Joined: 26 Feb 2003
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Location: Wisconsin
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| Posted: Sat Mar 27, 2004 4:43 pm Post subject: |
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| 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. |
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Jefklak
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| Posted: Sat Mar 27, 2004 4:58 pm Post subject: |
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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...
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dizzogg
Tux's lil' helper
Joined: 03 May 2002
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| Posted: Wed Mar 31, 2004 7:22 pm Post subject: |
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| 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.. |
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ed0n
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Location: Prishtine/Kosove
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| Posted: Wed Mar 31, 2004 8:01 pm Post subject: |
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| I tested ck few days ago, and I realized that in my p4 1.6ghz 512 mb ram desktop is faster with love-sources. |
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Cerement
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| Posted: Wed Mar 31, 2004 8:51 pm Post subject: |
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| 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 ... |
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dizzogg
Tux's lil' helper
Joined: 03 May 2002
Posts: 131
Location: Virginia, USA
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| Posted: Fri Apr 02, 2004 8:01 pm Post subject: |
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| 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.... |
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TenPin
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Posts: 500
Location: Kansas City
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| Posted: Fri Apr 02, 2004 11:26 pm Post subject: |
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| ck2 works fine here but I think it might be slightly worse that ck1 for responsive ness. Hard to judge though. |
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Corky
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| Posted: Sun Apr 04, 2004 6:03 am Post subject: |
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| 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.
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Jefklak
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| Posted: Sun Apr 04, 2004 9:09 am Post subject: |
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ck2 runs twice as good as the mm or love sources...
Now patching 2.6.5 @ ck2 
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