clock drifts with more than 1 windows 2008 guest

clock drifts with more than 1 windows 2008 guest

[Thomas Mueller]

hi

following situation:
- 1 physical host, 1x windows 2008 guest = clock ok
- 1 physical host, 2x windows 2008 guest = clock drifts

seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.

not tried the rtc option "driftfix" as man kvm states it only applies to 
i386 and i'm running debian amd64.


- Thomas

Re: clock drifts with more than 1 windows 2008 guest

[Gleb Natapov]

On Thu, Mar 18, 2010 at 11:50:00AM +0000, Thomas Mueller wrote:
> hi
> 
> following situation:
> - 1 physical host, 1x windows 2008 guest = clock ok
> - 1 physical host, 2x windows 2008 guest = clock drifts
> 
> seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
> 
> not tried the rtc option "driftfix" as man kvm states it only applies to 
> i386 and i'm running debian amd64.
> 
> 
Try it then. man kvm includes amd64 into i386.


--
			Gleb.

Re: clock drifts with more than 1 windows 2008 guest

[Gleb Natapov]

On Thu, Mar 18, 2010 at 02:05:47PM +0200, Gleb Natapov wrote:
> On Thu, Mar 18, 2010 at 11:50:00AM +0000, Thomas Mueller wrote:
> > hi
> > 
> > following situation:
> > - 1 physical host, 1x windows 2008 guest = clock ok
> > - 1 physical host, 2x windows 2008 guest = clock drifts
> > 
> > seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
> > 
> > not tried the rtc option "driftfix" as man kvm states it only applies to 
> > i386 and i'm running debian amd64.
> > 
> > 
> Try it then. man kvm includes amd64 into i386.
> 
> 
Almost forgot. driftfix does not work for win2k8 64 bit smp guest
currently.
 
--
			Gleb.

Re: clock drifts with more than 1 windows 2008 guest

[Thomas Mueller]

Am Thu, 18 Mar 2010 14:08:17 +0200 schrieb Gleb Natapov:

> On Thu, Mar 18, 2010 at 02:05:47PM +0200, Gleb Natapov wrote:
>> On Thu, Mar 18, 2010 at 11:50:00AM +0000, Thomas Mueller wrote:
>> > hi
>> > 
>> > following situation:
>> > - 1 physical host, 1x windows 2008 guest = clock ok - 1 physical
>> > host, 2x windows 2008 guest = clock drifts
>> > 
>> > seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
>> > 
>> > not tried the rtc option "driftfix" as man kvm states it only applies
>> > to i386 and i'm running debian amd64.
>> > 
>> > 
>> Try it then. man kvm includes amd64 into i386.
>> 
>> 
> Almost forgot. driftfix does not work for win2k8 64 bit smp guest
> currently.

forgot to tell that these are win2008 64bit guest systems (actually 
Windows 2008 Small Business Server "Premium"). 

hoping then for a working 64bit driftfix option. :)

thanks
- Thomas

Re: clock drifts with more than 1 windows 2008 guest

[Avi Kivity]

On 03/18/2010 02:28 PM, Thomas Mueller wrote:
> Am Thu, 18 Mar 2010 14:08:17 +0200 schrieb Gleb Natapov:
>
>    
>> On Thu, Mar 18, 2010 at 02:05:47PM +0200, Gleb Natapov wrote:
>>      
>>> On Thu, Mar 18, 2010 at 11:50:00AM +0000, Thomas Mueller wrote:
>>>        
>>>> hi
>>>>
>>>> following situation:
>>>> - 1 physical host, 1x windows 2008 guest = clock ok - 1 physical
>>>> host, 2x windows 2008 guest = clock drifts
>>>>
>>>> seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
>>>>
>>>> not tried the rtc option "driftfix" as man kvm states it only applies
>>>> to i386 and i'm running debian amd64.
>>>>
>>>>
>>>>          
>>> Try it then. man kvm includes amd64 into i386.
>>>
>>>
>>>        
>> Almost forgot. driftfix does not work for win2k8 64 bit smp guest
>> currently.
>>      
> forgot to tell that these are win2008 64bit guest systems (actually
> Windows 2008 Small Business Server "Premium").
>
> hoping then for a working 64bit driftfix option. :)
>
>    

It will work for uniprocessor guests, just not for smp guests.

-- 
error compiling committee.c: too many arguments to function

Re: clock drifts with more than 1 windows 2008 guest

[Zachary Amsden]

[-- Attachment #1: Type: text/plain, Size: 449 bytes --]

On 03/18/2010 01:50 AM, Thomas Mueller wrote:
> hi
>
> following situation:
> - 1 physical host, 1x windows 2008 guest = clock ok
> - 1 physical host, 2x windows 2008 guest = clock drifts
>
> seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
>
> not tried the rtc option "driftfix" as man kvm states it only applies to
> i386 and i'm running debian amd64.
>    

TARGET_I386 is also true for amd64.  However, the code appears broken 
upstream.



[-- Attachment #2: config-taget.patch --]
[-- Type: text/plain, Size: 408 bytes --]

CONFIG_TARGET_XXX is wrong

Signed-off-by: Zachary Amsden <zamsden@redhat.com>

diff --git a/vl.c b/vl.c
index 6e35cc6..9720619 100644
--- a/vl.c
+++ b/vl.c
@@ -1565,7 +1565,7 @@ static void configure_rtc(QemuOpts *opts)
             exit(1);
         }
     }
-#ifdef CONFIG_TARGET_I386
+#ifdef TARGET_I386
     value = qemu_opt_get(opts, "driftfix");
     if (value) {
         if (!strcmp(buf, "slew")) {

Re: clock drifts with more than 1 windows 2008 guest

[Avi Kivity]

On 03/19/2010 01:12 AM, Zachary Amsden wrote:
> On 03/18/2010 01:50 AM, Thomas Mueller wrote:
>> hi
>>
>> following situation:
>> - 1 physical host, 1x windows 2008 guest = clock ok
>> - 1 physical host, 2x windows 2008 guest = clock drifts
>>
>> seen with kvm-0.11 and kvm-0.12.3 and kernel 2.6.32.
>>
>> not tried the rtc option "driftfix" as man kvm states it only applies to
>> i386 and i'm running debian amd64.
>
> TARGET_I386 is also true for amd64.  However, the code appears broken 
> upstream.
>
>

Please post this on qemu-devel.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.