* -cpu core2duo still has no SSE4 support?
@ 2011-09-15 9:04 Jun Koi
2011-09-15 9:05 ` Sasha Levin
0 siblings, 1 reply; 5+ messages in thread
From: Jun Koi @ 2011-09-15 9:04 UTC (permalink / raw)
To: kvm
hi,
i run kvm with "-cpu core2duo" option, but /proc/cpuinfo only shows
SSE and SSE2.
my host is Core i7, so i suppose that i should have SSE4 with this
option, but it seems not?
is there any way to get SSE4?
(i am on kvm-0.12.3 on Ubuntu 10.04)
thanks,
Jun
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: -cpu core2duo still has no SSE4 support?
2011-09-15 9:04 -cpu core2duo still has no SSE4 support? Jun Koi
@ 2011-09-15 9:05 ` Sasha Levin
2011-09-15 9:14 ` Jun Koi
0 siblings, 1 reply; 5+ messages in thread
From: Sasha Levin @ 2011-09-15 9:05 UTC (permalink / raw)
To: Jun Koi; +Cc: kvm
On Thu, 2011-09-15 at 17:04 +0800, Jun Koi wrote:
> hi,
>
> i run kvm with "-cpu core2duo" option, but /proc/cpuinfo only shows
> SSE and SSE2.
> my host is Core i7, so i suppose that i should have SSE4 with this
> option, but it seems not?
>
> is there any way to get SSE4?
How about just running it with '-cpu host'?
--
Sasha.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: -cpu core2duo still has no SSE4 support?
2011-09-15 9:05 ` Sasha Levin
@ 2011-09-15 9:14 ` Jun Koi
2011-09-15 9:19 ` Dor Laor
2011-09-15 9:27 ` Sasha Levin
0 siblings, 2 replies; 5+ messages in thread
From: Jun Koi @ 2011-09-15 9:14 UTC (permalink / raw)
To: Sasha Levin; +Cc: kvm
On Thu, Sep 15, 2011 at 5:05 PM, Sasha Levin <levinsasha928@gmail.com> wrote:
> On Thu, 2011-09-15 at 17:04 +0800, Jun Koi wrote:
>> hi,
>>
>> i run kvm with "-cpu core2duo" option, but /proc/cpuinfo only shows
>> SSE and SSE2.
>> my host is Core i7, so i suppose that i should have SSE4 with this
>> option, but it seems not?
>>
>> is there any way to get SSE4?
>
> How about just running it with '-cpu host'?
hah, that works, thanks!
but then there are 2 problems:
- "-cpu host" should be exposed in the doc. "kvm -cpu ?" reports no
such option, so i missed it.
- "-cpu core2duo" should enable SSE4, but it doesnt. a bug?
thanks,
Jun
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: -cpu core2duo still has no SSE4 support?
2011-09-15 9:14 ` Jun Koi
@ 2011-09-15 9:19 ` Dor Laor
2011-09-15 9:27 ` Sasha Levin
1 sibling, 0 replies; 5+ messages in thread
From: Dor Laor @ 2011-09-15 9:19 UTC (permalink / raw)
To: Jun Koi; +Cc: Sasha Levin, kvm, Eduardo Habkost
On 09/15/2011 12:14 PM, Jun Koi wrote:
> On Thu, Sep 15, 2011 at 5:05 PM, Sasha Levin<levinsasha928@gmail.com> wrote:
>> On Thu, 2011-09-15 at 17:04 +0800, Jun Koi wrote:
>>> hi,
>>>
>>> i run kvm with "-cpu core2duo" option, but /proc/cpuinfo only shows
>>> SSE and SSE2.
>>> my host is Core i7, so i suppose that i should have SSE4 with this
>>> option, but it seems not?
>>>
>>> is there any way to get SSE4?
>>
>> How about just running it with '-cpu host'?
>
> hah, that works, thanks!
>
> but then there are 2 problems:
>
> - "-cpu host" should be exposed in the doc. "kvm -cpu ?" reports no
> such option, so i missed it.
> - "-cpu core2duo" should enable SSE4, but it doesnt. a bug?
If this model should have contain it, yes.
According to sysconfigs/target/target-x86_64.conf it shouldn't be in
core2duo but does appear in newer ones.
>
> thanks,
> Jun
> --
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: -cpu core2duo still has no SSE4 support?
2011-09-15 9:14 ` Jun Koi
2011-09-15 9:19 ` Dor Laor
@ 2011-09-15 9:27 ` Sasha Levin
1 sibling, 0 replies; 5+ messages in thread
From: Sasha Levin @ 2011-09-15 9:27 UTC (permalink / raw)
To: Jun Koi; +Cc: kvm
On Thu, 2011-09-15 at 17:14 +0800, Jun Koi wrote:
> On Thu, Sep 15, 2011 at 5:05 PM, Sasha Levin <levinsasha928@gmail.com> wrote:
> > On Thu, 2011-09-15 at 17:04 +0800, Jun Koi wrote:
> >> hi,
> >>
> >> i run kvm with "-cpu core2duo" option, but /proc/cpuinfo only shows
> >> SSE and SSE2.
> >> my host is Core i7, so i suppose that i should have SSE4 with this
> >> option, but it seems not?
> >>
> >> is there any way to get SSE4?
> >
> > How about just running it with '-cpu host'?
>
> hah, that works, thanks!
>
> but then there are 2 problems:
>
> - "-cpu host" should be exposed in the doc. "kvm -cpu ?" reports no
> such option, so i missed it.
> - "-cpu core2duo" should enable SSE4, but it doesnt. a bug?
SSE4 doesn't come built in with all core2duos. See
http://download.intel.com/design/mobile/datashts/31674505.pdf for
example.
--
Sasha.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-09-15 9:27 UTC | newest]
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2011-09-15 9:04 -cpu core2duo still has no SSE4 support? Jun Koi
2011-09-15 9:05 ` Sasha Levin
2011-09-15 9:14 ` Jun Koi
2011-09-15 9:19 ` Dor Laor
2011-09-15 9:27 ` Sasha Levin
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