>Happy to see that in the latest SLES9 kernel, the hz_timer is now
>"off" by default. It was so easy to miss that setting.
Thanks, because I had forgotten on my last 7 guests.
Mark D Pace
Senior Systems Engineer
Mainline Information Systems
1700 Summit Lake Drive
Tallahassee,
Happy to see that in the latest SLES9 kernel, the hz_timer is now
"off" by default. It was so easy to miss that setting.
Rob
--
Rob van der Heij
Velocity Software, Inc
http://velocitysoftware.com/
--
For LINUX-390
: [LINUX-390] Problem with sysctl and hz_timer on SLES8
I am trying to set my SLES8 guest up to have hz_timer set to 0 at boot. I
have found that this can be done using sysctl.conf or dynamically by
sysctl kernel.hz_timer=0. However, it seems that the sysctl
kernel.hz_timer=0 command does not work
Try:
sysctl -w kernel.hz_timer=0
> -Original Message-
> From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
> Eric Sammons
> Sent: Thursday, February 05, 2004 2:04 PM
> To: [EMAIL PROTECTED]
> Subject: Problem with sysctl and hz_timer on SLES8
>
>
>
Issue the command 'sysctl -p' after boot ( /etc/rc.d/boot.local).
On Thu, 2004-02-05 at 14:04, Eric Sammons wrote:
> I am trying to set my SLES8 guest up to have hz_timer set to 0 at boot. I
> have found that this can be done using sysctl.conf or dynamically by
> sysct
I am trying to set my SLES8 guest up to have hz_timer set to 0 at boot. I
have found that this can be done using sysctl.conf or dynamically by
sysctl kernel.hz_timer=0. However, it seems that the sysctl
kernel.hz_timer=0 command does not work.
See the following:
sysctl kernel.hz_timer
On Fri, 13 Jun 2003, Adam Thornton wrote:
> On Fri, 2003-06-13 at 02:03, John Summerfield wrote:
> > I would have thought it better to look at ACPI, which is supposed to
> > replace APM.
>
> FWIW, all ACPI has ever done for me, on either my Thinkpad X20 or my
> white-box dual-proc P3/866, is to ge
On Fri, 2003-06-13 at 02:03, John Summerfield wrote:
> I would have thought it better to look at ACPI, which is supposed to
> replace APM.
FWIW, all ACPI has ever done for me, on either my Thinkpad X20 or my
white-box dual-proc P3/866, is to generate kernel panics and keep me
from booting.
Adam
On Fri, 13 Jun 2003, Rob van der Heij wrote:
> Alan Cox wrote:
>
> > For an x86 hypervisor you'd probably use the APM interface to do this.
> > On modern x86 "hlt" also doesn't save power.
>
> I looked into the APM stuff in Linux for a generic way to let Linux
> tell VM it does not need resources
Alan Cox wrote:
For an x86 hypervisor you'd probably use the APM interface to do this.
On modern x86 "hlt" also doesn't save power.
I looked into the APM stuff in Linux for a generic way to let Linux
tell VM it does not need resources allocated now, but did not like
what I saw. From what I can tel
On Thu, Jun 12, 2003 at 10:24:08PM +1200, Vic Cross wrote:
> On Thu, 12 Jun 2003, John Summerfield wrote:
>
> > On Wed, 11 Jun 2003, Rod Furey wrote:
> >
> > > A more interesting question is: what do the User Mode Linux patches
> > > do?
> >
> > Run real, unmodified* Linux programs in a virtual co
On Thu, 12 Jun 2003, John Summerfield wrote:
> On Wed, 11 Jun 2003, Rod Furey wrote:
>
> > A more interesting question is: what do the User Mode Linux patches
> > do?
>
> Run real, unmodified* Linux programs in a virtual computer. UML uses
> standard user-space API to access virtual devices and me
On Wed, 11 Jun 2003, Rod Furey wrote:
> > What about somebody running Linux/Intel under Windows using VMWare? Or
> > somebody (weird?) running multiple Linux/Intel servers under VMWare/ESX?
>
> A more interesting question is: what do the User Mode Linux patches
> do?
Run real, unmodified* Linux p
On Wed, 11 Jun 2003, McKown, John wrote:
> What about somebody running Linux/Intel under Windows using VMWare? Or
> somebody (weird?) running multiple Linux/Intel servers under VMWare/ESX?
>
IBM will be offering Linux Virtual Servers on xSeries by years' end. I
don't know what the host OS will be
What about somebody running Linux/Intel under Windows using VMWare? Or
somebody (weird?) running multiple Linux/Intel servers under VMWare/ESX?
A more interesting question is: what do the User Mode Linux patches
do?
(Not being up on the internals of the kernel and not being able
to read the stuff (
aking any action based on it, is
strictly prohibited.
> -Original Message-
> From: Fargusson.Alan [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, June 11, 2003 12:33 PM
> To: [EMAIL PROTECTED]
> Subject: Re: hz_timer
>
>
> Interesting idea. Something similar would probab
Interesting idea. Something similar would probably apply to other processors as well,
if someone wrote a hypervisor for them.
-Original Message-
From: Alan Cox [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 11, 2003 10:17 AM
To: [EMAIL PROTECTED]
Subject: Re: hz_timer
On Mer, 2003-06
On Mer, 2003-06-11 at 18:13, Fargusson.Alan wrote:
> Part of the timer patch is machine dependant. Since most systems that run Linux
> don't have anything like VM there isn't any point in implementing the timer patch on
> them.
>
> I suspect that the (misnamed) halt instruction on the Intel syst
a VM like hypervisor, so the timer patch probably would not help.
-Original Message-
From: Rod Furey [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 11, 2003 4:27 AM
To: [EMAIL PROTECTED]
Subject: Re: hz_timer
> This is a kernel compile-time option.
> make menuconfig --->
>
John wrote:
>Did you try the man command?
Surprise, surprise!
Regards, Jim
Linux S/390-zSeries Support, SEEL, IBM Silicon Valley Labs
t/l 543-4021, 408-463-4021, [EMAIL PROTECTED]
*** Grace Happens ***
The option doesn't show up in my Intel .config file. I would have to say
that this particular option is Linux/390 specific.
Mark Post
-Original Message-
From: Rod Furey [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 11, 2003 7:27 AM
To: [EMAIL PROTECTED]
Subject: Re: hz_timer
&
This is a kernel compile-time option.
make menuconfig --->
General setup --->
[*] No HZ timer ticks in idle
[*] Idle HZ timer on by default
Erm... does it let you try this trick with any type
of processor? Could I build this into a PowerPC
nucleus for exam
On Tue, 10 Jun 2003, Jim Sibley wrote:
> So where is /etc/sysctl.conf documented? I did a grep on the string in the
> /usr/src/linux directory and and I found some informaiton on sysctl, bit I
> did not find the file (though I did a developer's opinion that one should
> read the code to find out h
So where is /etc/sysctl.conf documented? I did a grep on the string in the
/usr/src/linux directory and and I found some informaiton on sysctl, bit I
did not find the file (though I did a developer's opinion that one should
read the code to find out how sysctl works!.
So where does one look to fin
On Tue, 10 Jun 2003, Tom Duerbusch wrote:
> When I do a
> cat /proc/sys/kernel/hz_timer
> it shows a '1'.
>
> I set it to '0' as suggested for VM types. But after a boot, it is back
> to '1'. The documentation on this doesn't say anything
For those of us that have to build for both LPAR and VM, you might consider
adding this code to /etc/init.d/boot.local
if [ $(grep -c "version = FF" /proc/cpuinfo) != 0 ]
then
/sbin/sysctl -w kernel.hz_timer=0
fi
Regards, Jim
Linux S/390-zSeries Support, SEEL, IBM Sili
On Tue, 10 Jun 2003, Tom Duerbusch wrote:
> I set it to '0' as suggested for VM types. But after a boot, it is back
> to '1'. The documentation on this doesn't say anything about needing to
> put it in a boot script. Seems to imply that this is a one time only
> thing.
...
> 3. Is the docs wron
Does SuSE have an /etc/sysctl.conf?
If so, try putting a kernel.hz_timer = 0 in it... sysctl.conf's purpose
is to hold desired values for runtime-adjustable kernel parameters (like
at boot time), and you'd probably be better served placing your values
here than needing to hunt around for it at som
, 2003 1:32 PM
To: [EMAIL PROTECTED]
Subject: hz_timer
When I do a
cat /proc/sys/kernel/hz_timer
it shows a '1'.
I set it to '0' as suggested for VM types. But after a boot, it is back
to '1'. The documentation on this doesn't say anything about needing to
put
On Tue, 2003-06-10 at 12:31, Tom Duerbusch wrote:
> When I do a
> cat /proc/sys/kernel/hz_timer
> it shows a '1'.
>
> I set it to '0' as suggested for VM types. But after a boot, it is back
> to '1'. The documentation on this doesn't sa
When I do a
cat /proc/sys/kernel/hz_timer
it shows a '1'.
I set it to '0' as suggested for VM types. But after a boot, it is back
to '1'. The documentation on this doesn't say anything about needing to
put it in a boot script. Seems to imply that this is a o
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