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From Jason Strongman <>
Subject Re: ATS 5.1.1 And ESXI Ubuntu Guest
Date Fri, 21 Nov 2014 21:18:57 GMT
Jason.. thanks for your response.

Yeah I noticed vmware specific driver versions differ between RHEL 6.5 and
Ubuntu Precise/Trusty.. With the versions on RHEL 6.5 being a little behind
latest generic kernel of Precise/Trusty

Next, for my precise build, I simply installed 3.2.0-29-virtual, then
installed all the vmware provided modules(see below) built against this

Performance increased significantly, but RHEL still won out. Right now I am
looking at tweaking OS tuneables and see how much mileage that gets me.

On Thu, Nov 20, 2014 at 4:48 PM, Jason Giedymin <>

> I would record the kernel, and lspci, dmesg the hw/driver versions. You
> could be using different driver versions between the kernels.
> After that I’d look at the sysctl diffs between the two systems.
> Make sure the esxi resource entitlements and priorities are the same for
> each guest (which I’m sure you’ve already done, doesn’t hurt to double
> check).
> Wondering if your using my drivers for ESXi (though I’m sure they’d be out
> of date by now, and depends on what your networking hardware is).
> -J
> > On Nov 20, 2014, at 5:33 PM, Jason Strongman <
>> wrote:
> >
> >
> > Hypervisor Version - ESXi 5.5
> > Guest OS - Ubuntu 12.04.5 and 14.04.1 (64bit generic kernel)
> >
> >
> > While testing ATS in our Ubuntu guest VMs we noticed a significant
> performance difference(for the worse) between another RHEL 6.5 VM. Both VMs
> run in the same hypervisor and both VMs have the same 'hardware' specs.
> Both VMs also received the same identical 5gbps Spirent performance tests.
> Each test ensured that the tested objects are served from RAM cache. So it
> looks like(just guessing) the RHEL kernel may be optimized for virtual
> environments in terms of memory management??
> > I do notice the library and compiler versions differ between the ATS
> instances, the compile time options are the same. So I am not sure if that
> may be prove to be an issue as well.
> >
> > That said, are there any OS tuneables that I should review  within my
> Ubuntu builds?
> > Next I am going to try the various Ubuntu kernels and see if that
> results in the same RHEL performance.
> >
> > Thanks!
> >
> >

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