[LARTC] HZ to be 1000 - 2.5.25 may have this

[LARTC] HZ to be 1000 - 2.5.25 may have this

[bert hubert]

From lwn.net:

The current development kernel remains 2.5.24. Linus has not released any
kernels - or surfaced on the linux-kernel mailing list - since before OLS
and the Kernel Summit. Some patches are beginning to show up in his
BitKeeper tree, however; they include some SCSI updates, an NTFS update,
and, interestingly, a change of the internal x86 clock frequency to 1000 Hz.

1000Hz would mean great things for us shaping people!

Also, on a related note, see this on 'firm timers':
http://www.cse.ogi.edu/~luca/firm.html
More on http://www.cse.ogi.edu/~ashvin/

Thanks for Erik Walthinsen for pointing this out .

Regards,

bert

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Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

[Adam B. Fineberg]

bert hubert wrote:

>>From lwn.net:
>
>The current development kernel remains 2.5.24. Linus has not released any
>kernels - or surfaced on the linux-kernel mailing list - since before OLS
>and the Kernel Summit. Some patches are beginning to show up in his
>BitKeeper tree, however; they include some SCSI updates, an NTFS update,
>and, interestingly, a change of the internal x86 clock frequency to 1000 Hz.
>
>1000Hz would mean great things for us shaping people!
>  
>

Can this be done in 2.4.18 by changing HZ in include/asm-i386/param.h to 
1000? Would anything else need to be changed, like CLOCKS_PER_SEC (also 
in param.h)?

Best regards,
Adam Fineberg
fineberg@aviating.com

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Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

[Dmitriy]

On Tue, Jul 09, 2002 at 06:17:10PM -0700, Adam B. Fineberg wrote:
> bert hubert wrote:
> 
> >>From lwn.net:
> >
> >The current development kernel remains 2.5.24. Linus has not released any
> >kernels - or surfaced on the linux-kernel mailing list - since before OLS
> >and the Kernel Summit. Some patches are beginning to show up in his
> >BitKeeper tree, however; they include some SCSI updates, an NTFS update,
> >and, interestingly, a change of the internal x86 clock frequency to 1000 
> >Hz.
> >
> >1000Hz would mean great things for us shaping people!
> > 
> >
> 
> Can this be done in 2.4.18 by changing HZ in include/asm-i386/param.h to 
> 1000? Would anything else need to be changed, like CLOCKS_PER_SEC (also 
> in param.h)?
Try to download this url:
http://www.ibiblio.org/gentoo/distfiles/linux-gentoo-2.4.19-crypto-r7.patch.bz2

This is gentoo Linux patch to 2.4.18, which adds Low Latency Scheduling,
Preemptible Kernel, rmap, Ingo Molnar o(1) scheduler and by default it has
HZ equal to 1000. Also there is XFS, Grsec and lots of other usefull
staff.

Patch is about 6.4Mbyte.
Luck.
> 
> Best regards,
> Adam Fineberg
> fineberg@aviating.com
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> 
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Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

[Werner Almesberger]

Adam B. Fineberg wrote:
> Can this be done in 2.4.18 by changing HZ in include/asm-i386/param.h to 
> 1000?

Yes.

> Would anything else need to be changed, like CLOCKS_PER_SEC (also 
> in param.h)?

Hmm, CLOCKS_PER_SEC doesn't look right, particularly if you look at
include/asm-ia64/ia32.h:IA32_CLOCKS_PER_SEC. It's only used for some
obscure parameter-passing mechanism in ELF, so the damage should be
quite limited. (I.e. I've never noticed anything going wrong when
changing HZ, and I didn't realize the CLOCKS_PER_SEC dependency
until now.)

- Werner

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Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

[Adam B. Fineberg]

Dmitriy,

I tried applying the patch you suggested 
(http://www.ibiblio.org/gentoo/distfiles/linux-gentoo-2.4.19-crypto-r7.patch.bz2) 
and after I sorted through a few things with the patching (since I 
already had a HTB) I tried a make xconfig and got the following:

rm -f include/asm
( cd include ; ln -sf asm-i386 asm)
make -C scripts kconfig.tk
make[1]: Entering directory `/usr/src/linux-2.4.18-WMUX-low-latency/scripts'
cat header.tk >> ./kconfig.tk
./tkparse < ../arch/i386/config.in >> kconfig.tk
-: 309: can't handle dep_bool/dep_mbool/dep_tristate condition
make[1]: *** [kconfig.tk] Error 1
make[1]: Leaving directory `/usr/src/linux-2.4.18-WMUX-low-latency/scripts'
make: *** [xconfig] Error 2

Any ideas how to proceed or who/where else I can ask?

Best regards,
Adam Fineberg

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RE: [LARTC] HZ to be 1000 - 2.5.25 may have this

[CIT/Paul]

HZ is set to 100 in that patch.. :>


-----Original Message-----
From: lartc-admin@mailman.ds9a.nl [mailto:lartc-admin@mailman.ds9a.nl]
On Behalf Of Dmitriy
Sent: Wednesday, July 10, 2002 1:30 AM
To: lartc@mailman.ds9a.nl
Subject: Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

On Tue, Jul 09, 2002 at 06:17:10PM -0700, Adam B. Fineberg wrote:
> bert hubert wrote:
> 
> >>From lwn.net:
> >
> >The current development kernel remains 2.5.24. Linus has not released
any
> >kernels - or surfaced on the linux-kernel mailing list - since before
OLS
> >and the Kernel Summit. Some patches are beginning to show up in his
> >BitKeeper tree, however; they include some SCSI updates, an NTFS
update,
> >and, interestingly, a change of the internal x86 clock frequency to
1000 
> >Hz.
> >
> >1000Hz would mean great things for us shaping people!
> > 
> >
> 
> Can this be done in 2.4.18 by changing HZ in include/asm-i386/param.h
to 
> 1000? Would anything else need to be changed, like CLOCKS_PER_SEC
(also 
> in param.h)?
Try to download this url:
http://www.ibiblio.org/gentoo/distfiles/linux-gentoo-2.4.19-crypto-r7.pa
tch.bz2

This is gentoo Linux patch to 2.4.18, which adds Low Latency Scheduling,
Preemptible Kernel, rmap, Ingo Molnar o(1) scheduler and by default it
has
HZ equal to 1000. Also there is XFS, Grsec and lots of other usefull
staff.

Patch is about 6.4Mbyte.
Luck.
> 
> Best regards,
> Adam Fineberg
> fineberg@aviating.com
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> 
-- 
With Respect
Dmitriy Kuznetsov
_______________________________________________
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Re: [LARTC] HZ to be 1000 - 2.5.25 may have this

[Adam B. Fineberg]

[-- Attachment #1: Type: text/plain, Size: 354 bytes --]

CIT/Paul wrote:

>HZ is set to 100 in that patch.. :>
>
>  
>
>>    
>>
>Try to download this url:
>http://www.ibiblio.org/gentoo/distfiles/linux-gentoo-2.4.19-crypto-r7.pa
>tch.bz2
>  
>

Acutally in this patch the clock rate becomes configurable.  HZ is set 
to CONFIG_JIFFIES which defaults to 1000.

Best regards,
Adam Fineberg
fineberg@aviating.com

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