* What are the rules for hyperthreaded CPUs?
@ 2011-12-05 0:41 Todd And Margo Chester
0 siblings, 0 replies; 3+ messages in thread
From: Todd And Margo Chester @ 2011-12-05 0:41 UTC (permalink / raw)
To: kvm
Hi All,
My host has an i7-960 processor (4 cores, 8 hypterthreaded cores.)
/proc/cpuinfo on my host shows 8 processors.
On my Fedora Core 16 guest, /proc/cpuinfo shows 4 processors.
Question: what is the maximum number of processors I can assign to my
guest? 4 or 8? What are the rules for Hyperthreading?
Many thanks,
-T
^ permalink raw reply [flat|nested] 3+ messages in thread
* What are the rules for hyperthreaded CPUs?
@ 2011-12-05 1:26 Todd And Margo Chester
2011-12-05 7:42 ` Michael Tokarev
0 siblings, 1 reply; 3+ messages in thread
From: Todd And Margo Chester @ 2011-12-05 1:26 UTC (permalink / raw)
To: kvm
> Hi All,
>
> My host has an i7-960 processor (4 cores, 8 hypterthreaded cores.)
> /proc/cpuinfo on my host shows 8 processors.
>
> On my Fedora Core 16 guest, /proc/cpuinfo shows 4 processors.
>
> Question: what is the maximum number of processors I can assign to my
> guest? 4 or 8? What are the rules for Hyperthreading?
>
> Many thanks,
> -T
Figured it out. The max cores is the number of hyperthreaded cores
(eight in my case).
My mistake was that in virt-manager, processor, I was not clicking
on "Copy host CPU configuration" button. Without that, everything
I tried to configure came out as single CPUs.
-T
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: What are the rules for hyperthreaded CPUs?
2011-12-05 1:26 Todd And Margo Chester
@ 2011-12-05 7:42 ` Michael Tokarev
0 siblings, 0 replies; 3+ messages in thread
From: Michael Tokarev @ 2011-12-05 7:42 UTC (permalink / raw)
To: Todd And Margo Chester; +Cc: kvm
On 05.12.2011 05:26, Todd And Margo Chester wrote:
>> Hi All,
>>
>> My host has an i7-960 processor (4 cores, 8 hypterthreaded cores.)
>> /proc/cpuinfo on my host shows 8 processors.
>>
>> On my Fedora Core 16 guest, /proc/cpuinfo shows 4 processors.
>>
>> Question: what is the maximum number of processors I can assign to my
>> guest? 4 or 8? What are the rules for Hyperthreading?
>>
>> Many thanks,
>> -T
>
> Figured it out. The max cores is the number of hyperthreaded cores
> (eight in my case).
The maximum number of guest vCPUs is unlimited - you can assign, say,
100 cores - each vCPU core is just a thread on host, it does not
correspond to any physical characteristics of your host.
/mjt
^ permalink raw reply [flat|nested] 3+ messages in thread
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