Re: [dpdk-users] AVX-512

[Tharaneedharan Vilwanathan <vdharani@gmail.com>]

Hi Don,

Thanks for sharing your thoughts.

The CPU I have is: "Intel(R) Xeon(R) Gold 6130 CPU @ 2.10GHz"

Would what you say apply to this as well?

Anyway, the prime reason why I am having this server is to play with
AVX-512. So I would like to try it.

Regards
dharani


On Tue, Mar 13, 2018 at 8:20 PM, Don maillist <dlw.mailist@gmail.com> wrote:

> Be careful with AVX-512. It is best to use AVX-256 on Skylake. The AVX-512
> applications do not run efficiently today on Skylake. It increases power
> consumption in the underlying cores.
>
> Best Regards,
> Don
>
> On Thu, Mar 1, 2018 at 7:57 PM, Tharaneedharan Vilwanathan <
> vdharani@gmail.com> wrote:
>
>> Hi Stephen,
>>
>> Appreciate your response.
>>
>> I have ESXi. I am still trying to map the KVM config with ESXi but no luck
>> yet. I have requested the admin to figure out. If anyone is familiar with
>> ESXi configuration for this, please let me know.
>>
>> Thanks
>> dharani
>>
>> On Fri, Feb 23, 2018 at 11:38 AM, Stephen Hemminger <
>> stephen@networkplumber.org> wrote:
>>
>> > On Fri, 23 Feb 2018 11:16:14 -0800
>> > Tharaneedharan Vilwanathan <vdharani@gmail.com> wrote:
>> >
>> > > Hi All,
>> > >
>> > > I have a quick question. I got a new server with the CPU that should
>> have
>> > > AVX-512 support but I don't see it in Linux (Ubuntu 18.04).
>> > >
>> > > Here is the output:
>> > >
>> > > auto@auto-virtual-machine:~$ *cat /proc/cpuinfo*
>> > > processor : 0
>> > > vendor_id : GenuineIntel
>> > > cpu family : 6
>> > > model : 85
>> > > model name : *Intel(R) Xeon(R) Gold 6130 CPU @ 2.10GHz*
>> > > stepping : 4
>> > > microcode : 0x2000029
>> > > cpu MHz : 2095.078
>> > > cache size : 22528 KB
>> > > physical id : 0
>> > > siblings : 2
>> > > core id : 0
>> > > cpu cores : 2
>> > > apicid : 0
>> > > initial apicid : 0
>> > > fpu : yes
>> > > fpu_exception : yes
>> > > cpuid level : 22
>> > > wp : yes
>> > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
>> pat
>> > > pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm
>> > > constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable
>> > nonstop_tsc
>> > > cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe
>> popcnt
>> > > tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm
>> > > 3dnowprefetch cpuid_fault invpcid_single pti fsgsbase tsc_adjust bmi1
>> hle
>> > > avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt arat
>> > > bugs : cpu_meltdown spectre_v1 spectre_v2
>> > > bogomips : 4190.15
>> > > clflush size : 64
>> > > cache_alignment : 64
>> > > address sizes : 42 bits physical, 48 bits virtual
>> > > power management:
>> > >
>> > > Can someone tell me why I don't see AVX-512?
>> > >
>> > > Appreciate your help.
>> > >
>> > > Thanks
>> > > dharani
>> >
>> > If you are running in a VM, make sure that your hypervisor passes the
>> avx
>> > flags through.
>> > In KVM this is usually done with the "Copy host CPU configuration" in
>> virt
>> > manager.
>> >
>>
>
>