process priority at 25

process priority at 25

[Axel H. Siebenwirth]

Hi,

I alway thought process priorities range from -20 to 19 (also according to
"man nice"). But under kernel 2.5.16 I run top and process is display with
priority 25..

Is there perhaps something wrong?

Thank you,
Axel
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Re: process priority at 25

[Richard Adams]

On Sunday 19 May 2002 14:29, Axel H. Siebenwirth wrote:
> Hi,
>
> I alway thought process priorities range from -20 to 19 (also according to
> "man nice"). But under kernel 2.5.16 I run top and process is display with
> priority 25..
>
> Is there perhaps something wrong?

First thing i would do is try a "proven" kernel, 2.5.x i belive is development
but there again considering the 2.5 kernel series of development is at kernel 
2.5.11 i presume you mean 2.4.16.?

At the minute i dont have access to a machine running a 2.4 kernel so i 
cannot comment further.

>
> Thank you,
> Axel

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: process priority at 25

[Axel H. Siebenwirth]

Hi Richard!

On Sun, 19 May 2002, Richard Adams wrote:

> First thing i would do is try a "proven" kernel, 2.5.x i belive is development
> but there again considering the 2.5 kernel series of development is at kernel 
> 2.5.11 i presume you mean 2.4.16.?

It really is 2.5.16 and that is where 2.5 kernel development is at right
now.

Regards,
Axel
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Re: process priority at 25

[Richard Adams]

On Sunday 19 May 2002 19:17, you wrote:
> Hi Richard!
>
> On Sun, 19 May 2002, Richard Adams wrote:
> > First thing i would do is try a "proven" kernel, 2.5.x i belive is
> > development but there again considering the 2.5 kernel series of
> > development is at kernel 2.5.11 i presume you mean 2.4.16.?
>
> It really is 2.5.16 and that is where 2.5 kernel development is at right
> now.

How correct you are, it seems ftp.nl.kernel.org was behind, i see its been 
updated now.
I dont follow 2.5 myself.

>
> Regards,
> Axel

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: process priority at 25

[Tom Beer]

Hi,

> > Is there perhaps something wrong?
>
> First thing i would do is try a "proven" kernel, 2.5.x i belive is development
> but there again considering the 2.5 kernel series of development is at kernel
> 2.5.11 i presume you mean 2.4.16.?
>

Kernel 2.4.18 won't run on my off-the-shelf athlon-asus motherboard
configuration. Mounting of disks during startup leads to seg faults.
2.4.4 runs with small amounts of seg. faults, caused by an installation of
amanda, some month ago. I thought that the uneven numbers are experimental, but
the even numbers would be "stable"?

Greets Tom

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Re: process priority at 25

[Richard Adams]

On Sunday 19 May 2002 22:29, Tom Beer wrote:
> Hi,

> Kernel 2.4.18 won't run on my off-the-shelf athlon-asus motherboard
> configuration. Mounting of disks during startup leads to seg faults.
> 2.4.4 runs with small amounts of seg. faults, caused by an installation of
> amanda, some month ago. I thought that the uneven numbers are experimental,
> but the even numbers would be "stable"?

Well it should run ok or at least i have not heard of problems with disk's.
Considering you say other kernels give simalar problems then i would say its 
a local problem and not a kernel issue.

No even or uneven make no differance.
2.5.x are development.
2.4.xx are considered stable.

>
> Greets Tom

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: process priority at 25

[Axel H. Siebenwirth]

Hi Tom!

On Mon, 20 May 2002, Tom Beer wrote:

> amanda, some month ago. I thought that the uneven numbers are experimental, but
> the even numbers would be "stable"?

For example in kernel version number 2.4.18
				     2 is the VERSION
				       4 is the PATCHLEVEL and
					 18 is the SUBLEVEL.

I believe since kernel version 2, kernel development was arranged in a way
that even PATCHLEVELs are regarded as a "stable" branch and an uneven
PATCHLEVEL is a "development" branch that regular linux users should not
work with. It is only for kernel developers for working out a "better
kernel". So 2.5 is not for regular use.

Regards,
Axel
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Re: process priority at 25

[Steven Smith]

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> I alway thought process priorities range from -20 to 19 (also according to
> "man nice"). But under kernel 2.5.16 I run top and process is display with
> priority 25..
A process's nice value is not the same thing as its priority. niceness
is used in the calculation of priority, but they're not bound together.
In particular, a process's priority is liable to become numerically
greater (-> lower priority) if it makes heavy use of the processor
(this is supposed to stop something like ``while (1) ; '' bringing
down the system), while a process which makes heavy use of the disk
is likely to get slightly higher priority (because as soon as it hits
the disk, it blocks, and something else can run).

Under 2.4 kernels, priority is constrained between 0 and 20 (for non-realtime
processes), but there's no reason why the same thing should apply to 2.5
kernels.

Steven Smith,
sos22@cam.ac.uk.

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