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 kernel. http://packages.vmware.com/tools/esx/5.5u2/ubuntu/dists/precise/main/binary-amd64/index.html 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 <[email protected]> wrote: > 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 < > [email protected]> 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! > > > > > >
