Re: [ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

2018-03-05 Thread Michal Skrivanek


> On 27 Feb 2018, at 10:53, Marco Lorenzo Crociani 
>  wrote:
> 
>> Skylake-Client does _not_ have AVX512 (I tried now on a Kaby Lake Core
>> i7 laptop).  Only Skylake-Server has it and it will be in RHEL 7.5.
>> Thanks,
>> Paolo
> 
> Ok, we'll stay with pass-through until RHEL 7.5.

Note that support for Skylake-Server is already in oVirt 4.2.2, once you’re 
running on a hypervisor which supports that(e.g. RHEL 7.5 beta) it should work, 
when you run on the exsiting 7.4 it just won’t work (the option is there 
though, and we separated the generic former “Skylake” to Skylake-Client and 
Skylake-Server)

Thanks,
michal


> Thanks,
> 
> -- 
> Marco Crociani
> Prisma Telecom Testing S.r.l.
> via Petrocchi, 4  20127 MILANO  ITALY
> Phone:  +39 02 26113507
> Fax:  +39 02 26113597
> e-mail:  mar...@prismatelecomtesting.com
> web:  http://www.prismatelecomtesting.com

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Re: [ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

2018-02-28 Thread Marco Lorenzo Crociani

Skylake-Client does _not_ have AVX512 (I tried now on a Kaby Lake Core
i7 laptop).  Only Skylake-Server has it and it will be in RHEL 7.5.

Thanks,

Paolo



Ok, we'll stay with pass-through until RHEL 7.5.
Thanks,

--
Marco Crociani
Prisma Telecom Testing S.r.l.
via Petrocchi, 4  20127 MILANO  ITALY
Phone:  +39 02 26113507
Fax:  +39 02 26113597
e-mail:  mar...@prismatelecomtesting.com
web:  http://www.prismatelecomtesting.com
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Re: [ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

2018-02-27 Thread Paolo Bonzini
On 27/02/2018 09:37, Sandro Bonazzola wrote:
> 
> Virtual Machine settings
> A) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family)
> General Tab shows: Guest CPU Type: Skylake-Client
> 
> avx512: NO
> 
> B) VM:
> Custom CPU Type: Skylake-Client
> General Tab shows: Guest CPU Type: Skylake-Client
> 
> avx512: NO
> 
> C) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family) [grey -
> cannot modify]
> Migration mode: Do not allow migration
> Pass-Through Host CPU
> General Tab shows: Guest CPU Type: Skylake-Client
> 
> avx512: YES   ( cat /proc/cpuinfo  |grep avx512: avx512f avx512dq
> avx512cd avx512bw avx512vl )
> 
> Using pass-through host cpu (disabling vm migration) is the only way to
> access avx512 in a VM, is it a bug or am I missing something?

Skylake-Client does _not_ have AVX512 (I tried now on a Kaby Lake Core
i7 laptop).  Only Skylake-Server has it and it will be in RHEL 7.5.

Thanks,

Paolo
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Re: [ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

2018-02-27 Thread Sandro Bonazzola
2018-02-26 17:49 GMT+01:00 Marco Lorenzo Crociani <
mar...@prismatelecomtesting.com>:

> Hi,
> I can't access avx512* instruction set from virtual machines.
>

Added some relevant people.



> I have made a one server compute cluster to test new hardware:
>
> oVirt 4.1.9
> CentOS 7
> Cluster CPU Type: Intel Skylake Family
> Compatibility Version: 4.1
>
> HOST:
> CPU Model Name:Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz
> Family: Family
> CPU Type: Intel Skylake Family
>
> Virtual Machine settings
> A) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family)
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: NO
>
> B) VM:
> Custom CPU Type: Skylake-Client
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: NO
>
> C) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family) [grey - cannot
> modify]
> Migration mode: Do not allow migration
> Pass-Through Host CPU
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: YES   ( cat /proc/cpuinfo  |grep avx512: avx512f avx512dq avx512cd
> avx512bw avx512vl )
>
> Using pass-through host cpu (disabling vm migration) is the only way to
> access avx512 in a VM, is it a bug or am I missing something?
>
> Regards,
>
> --
> Marco Crociani
> Prisma Telecom Testing S.r.l.
> via Petrocchi, 4  20127 MILANO  ITALY
> Phone:  +39 02 26113507
> Fax:  +39 02 26113597
> e-mail:  mar...@prismatelecomtesting.com
> web:  http://www.prismatelecomtesting.com
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>



-- 

SANDRO BONAZZOLA

ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R

Red Hat EMEA 

TRIED. TESTED. TRUSTED. 
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[ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

2018-02-26 Thread Marco Lorenzo Crociani

Hi,
I can't access avx512* instruction set from virtual machines.
I have made a one server compute cluster to test new hardware:

oVirt 4.1.9
CentOS 7
Cluster CPU Type: Intel Skylake Family
Compatibility Version: 4.1

HOST:
CPU Model Name:Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz
Family: Family
CPU Type: Intel Skylake Family

Virtual Machine settings
A) VM:
Custom CPU Type: Use cluster default(Intel Skylake Family)
General Tab shows: Guest CPU Type: Skylake-Client

avx512: NO

B) VM:
Custom CPU Type: Skylake-Client
General Tab shows: Guest CPU Type: Skylake-Client

avx512: NO

C) VM:
Custom CPU Type: Use cluster default(Intel Skylake Family) [grey - 
cannot modify]

Migration mode: Do not allow migration
Pass-Through Host CPU
General Tab shows: Guest CPU Type: Skylake-Client

avx512: YES   ( cat /proc/cpuinfo  |grep avx512: avx512f avx512dq 
avx512cd avx512bw avx512vl )


Using pass-through host cpu (disabling vm migration) is the only way to 
access avx512 in a VM, is it a bug or am I missing something?


Regards,

--
Marco Crociani
Prisma Telecom Testing S.r.l.
via Petrocchi, 4  20127 MILANO  ITALY
Phone:  +39 02 26113507
Fax:  +39 02 26113597
e-mail:  mar...@prismatelecomtesting.com
web:  http://www.prismatelecomtesting.com
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