rhel/fedora clock drift?

In rhel 4 and fc5 and fc6 the clock interrupt in the
kernel is 1000mhz. AFAIK this is too high and causes
the clock to drift and lose sync. This is even more of
a problem for virtual servers like vmware or zen.
Anyone experience this issue and have any workarounds
other than recompiling the kernel. Seems like a
drastic measure just to get an OS to keep accurate
time. I have looked for around for solutions and
thought maybe my fellow ldap admins might know something.


 
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> -----Original Message-----
> From: fedora-directory-users-bouncesredhat.com 
> [mailto:fedora-directory-users-bouncesredhat.com] On Behalf 
> Of Scott Roberts
> Sent: Sunday, February 11, 2007 10:51 AM
> To: fedora-directory-usersredhat.com
> Subject: [Fedora-directory-users] rhel/fedora clock
drift?
> 
> In rhel 4 and fc5 and fc6 the clock interrupt in the
kernel 
> is 1000mhz. AFAIK this is too high and causes the clock
to 
> drift and lose sync. This is even more of a problem for

> virtual servers like vmware or zen.
> Anyone experience this issue and have any workarounds
other 
> than recompiling the kernel. Seems like a drastic
measure 
> just to get an OS to keep accurate time. I have looked
for 
> around for solutions and thought maybe my fellow ldap
admins 
> might know something.

NTP?

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You can pass clock=pit to the kernel on boot up or use NTP.



On Sun, 2007-02-11 at 10:51 -0800, Scott Roberts wrote:
> In rhel 4 and fc5 and fc6 the clock interrupt in the
> kernel is 1000mhz. AFAIK this is too high and causes
> the clock to drift and lose sync. This is even more of
> a problem for virtual servers like vmware or zen.
> Anyone experience this issue and have any workarounds
> other than recompiling the kernel. Seems like a
> drastic measure just to get an OS to keep accurate
> time. I have looked for around for solutions and
> thought maybe my fellow ldap admins might know
something.
> 
> 
>  
>
____________________________________________________________
________________________
> TV dinner still cooling? 
> Check out "Tonight's Picks" on Yahoo! TV.
> http://tv.yahoo.com/
> 
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> https://www.redhat.com/mailman/listinfo/fedora-dir
ectory-users

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If you are using VMware virtual servers, the recommendation
is to use 
the following two corrective measures:

1. Append clock=pit to your kernel boot line in grub.conf
2. In the vmx file for your virtual server, add the
following line, or 
modify it if it already exists as false:

   tools.syncTime = "TRUE"

You can also configure this value through the VC console and
you must 
restart the virtual machine after making these changes for
it to take 
effect.

Then make sure you have the VMware tools installed,
configured, and running.

ref:  http
://www.vmware.com/pdf/vmware_timekeeping.pdf

Thanks,
Josh Miller, RHCE


> Scott Belnap wrote:
>> You can pass clock=pit to the kernel on boot up or
use NTP.
>>
>>
>>
>> On Sun, 2007-02-11 at 10:51 -0800, Scott Roberts
wrote:
>>> In rhel 4 and fc5 and fc6 the clock interrupt
in the
>>> kernel is 1000mhz. AFAIK this is too high and
causes
>>> the clock to drift and lose sync. This is even
more of
>>> a problem for virtual servers like vmware or
zen.
>>> Anyone experience this issue and have any
workarounds
>>> other than recompiling the kernel. Seems like
a
>>> drastic measure just to get an OS to keep
accurate
>>> time. I have looked for around for solutions
and
>>> thought maybe my fellow ldap admins might know
something.
>>>
>>>
>>>  
>>>
____________________________________________________________
________________________ 
>>>
>>> TV dinner still cooling? Check out
"Tonight's Picks" on Yahoo! TV.
>>> http://tv.yahoo.com/
>>>
>>> -- 
>>> Fedora-directory-users mailing list
>>> Fedora-directory-usersredhat.com
>>> https://www.redhat.com/mailman/listinfo/fedora-dir
ectory-users
>>
>> -- 
>> Fedora-directory-users mailing list
>> Fedora-directory-usersredhat.com
>> https://www.redhat.com/mailman/listinfo/fedora-dir
ectory-users
>>
> 

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ectory-users

If you are using VMware virtual servers, the recommendation
is to use 
the following two corrective measures:

1. Append clock=pit to your kernel boot line in grub.conf
2. In the vmx file for your virtual server, add the
following line, or 
modify it if it already exists as false:

   tools.syncTime = "TRUE"

You can also configure this value through the VC console and
you must 
restart the virtual machine after making these changes for
it to take 
effect.

Then make sure you have the VMware tools installed,
configured, and running.

ref:  http
://www.vmware.com/pdf/vmware_timekeeping.pdf

Thanks,
Josh Miller, RHCE

Scott Belnap wrote:
> You can pass clock=pit to the kernel on boot up or use
NTP.
> 
> 
> 
> On Sun, 2007-02-11 at 10:51 -0800, Scott Roberts
wrote:
>> In rhel 4 and fc5 and fc6 the clock interrupt in
the
>> kernel is 1000mhz. AFAIK this is too high and
causes
>> the clock to drift and lose sync. This is even more
of
>> a problem for virtual servers like vmware or zen.
>> Anyone experience this issue and have any
workarounds
>> other than recompiling the kernel. Seems like a
>> drastic measure just to get an OS to keep accurate
>> time. I have looked for around for solutions and
>> thought maybe my fellow ldap admins might know
something.
>>
>>
>>  
>>
____________________________________________________________
________________________
>> TV dinner still cooling? 
>> Check out "Tonight's Picks" on Yahoo!
TV.
>> http://tv.yahoo.com/
>>
>> --
>> Fedora-directory-users mailing list
>> Fedora-directory-usersredhat.com
>> https://www.redhat.com/mailman/listinfo/fedora-dir
ectory-users
> 
> --
> Fedora-directory-users mailing list
> Fedora-directory-usersredhat.com
> https://www.redhat.com/mailman/listinfo/fedora-dir
ectory-users
> 

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