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0e1f616
(Get the code!)
@brad-figg We are very sorry.
The bottom line is that we are not seeing good performance on 3.13 going back for many builds, with or without the 7 patches we are requesting. Do not hold any release for resolution of this issue. I recommend going forward with the 7 patches in place.
The difference in performance is compared to our 14.04 baseline, (our 14.04.2 baseline) which was with a different series of kernel, 3.16. As you may know, we put a lot of effort into utopic (and vivid, and wily) to make the LTS as good as possible on Hyper-V.
There are multiple bugs in which we were unable to take things back to 3.13, and it's clear that something important is still missing. If there was some way for customer on 12.04 to run later HWE kernels, maybe that is the ultimate solution.