On Sun, Aug 24, 2014 at 12:57 PM, John Lauro
<[log in to unmask]> wrote:
> Why spread FUD about Vmware.  Anyways, to hear what they say on the subject:
> http://www.vmware.com/files/pdf/techpaper/latency-sensitive-perf-vsphere55.pdf
>
> Anyways, KVM will not handle latency any better than Vmware.
>
> ----- Original Message -----
>> From: "Paul Robert Marino" <[log in to unmask]>
>> To: "Nico Kadel-Garcia" <[log in to unmask]>
>> Cc: "Brandon Vincent" <[log in to unmask]>, [log in to unmask], "[log in to unmask]"
>> <[log in to unmask]>
>> Sent: Sunday, August 24, 2014 12:26:17 PM
>> Subject: Re: about realtime system
>>
>> Wow I don't know how VMware got mentioned in this string but VMware
>> is
>> not capable of real time operation and if you ask the senior
>> engineers
>> at VMware they will tell you they don't want you even trying it on
>> their product because they know it wont work. The reason is VMware
>> plays games with the clock on the VM so the clocks can never be 100%
>> accurate.
>> It should be possible to do real time in KVM assuming you don't
>> overbook your CPU Cores or RAM. Apparently Red Hat has been doing
>> VM's
>> with microsecond accurate clocks with PTP running on the
>> visualization


I mentioned that I hope they were using real servers, not VM's. I'd
had people try to run "real-time" systems in virtualization,
specifically with VMware, and it wasn't workable for their needs.

Also, "high precision" is not the same as "low latency", although both
are often grouped together for "real-time" operations. I'm curious if
Paul needs both.