Awesome! Thank you Andy! :-D
On 21 July 2014 16:41, Andy Whitcroft <a...@canonical.com> wrote: > > I don't want to be rude but, Linux 3.13 sucks a lot. > > > > I'm wondering here, for God's sake, why Ubuntu 14.04 comes with this lame > > kernel? What Ubuntu Kernel Team have in mind?! > > This kernel was selected using the standard criteria for an LTS, a kernel > which would release sufficiently early in the cycle to allow a significant > number of stable cycles to occur before release and particularly before > the first point release. For this cycle that was v3.13. This was > a conservative choice as this cycle is an LTS so we aim to have a > significantly longer stablisation time than that in a regular cycle. > There was no indication that this was expected to be a worse kernel > than any other we might have selected (v3.12 or v3.14). This choice was > discussed and announced at the various UDS/vUDS/ODS sessions. > > > Mark Shuttlework *must say something about this situation*. What he is > > gonna do? I really t want to know that. > > > > I'm a HUGE fan of Ubuntu, and I mean it, I have no plans to switch off > > Ubuntu and I'll stick with 14.04 but, definitely, Linux 3.13 was a bad, > bad > > choice for a LTS version like Trusty. > > [list of bugs elided for brevity] > > There seem to be two separate issues triggered by QEMU/KVM setups likely > significantly exacerbated on truly NUMA kit. From the descriptions you > posted in your original email these likely are all examples of those > two issues. > > Both the Kernel and Server Teams are aware of these issues and are actively > working with the support organisation to isolate the root causes and fixes > for them and will be SRUing any such fixes as soon as sensibly possible. > In the mean time it has been recommended that KSM be disabled, and support > advisories to this effect have been issued. Separatly we are reviewing > all of the bugs that have been reported on these kinds of issues to > categorise them and to try and confirm they are the same root cause. > > > I just installed a lot of QEmu 2.0 Hypervisors with Trusty, including a > > brand new Cloud Computing with OpenStack IceHouse and, guess what?! Lots > of > > problems... Because of Linux 3.13. > > > > *This is a unprecedented situation*, Canonical must provide a new Kernel > > version for Trusty ASAP! This is affecting hundreds of people around the > > world that are trusting in Trusty but, it is not trustable right now. > :-/ > > > > As a workaround, I backported the Kernel from Utopic, since I need the > bnx2 > > kernel module (linux extra), I can not just use the mainline packages > > as-is... > > As stated previously, the current recommendation is to disable KSM if you > are > experiencing these issues. Once the root cause is isolated fixes will be > released for the 3.13 based kernels via the normal updates process. > > [installation instructions elided for brevity] > > > IMPORTANT NOTE: I still did not tested this Linux 3.16 from Utopic on > > Trusty but, at this point, anything is better than Linux 3.13. I know > that > > my environment is terrible with 3.13 and I'll report here if it becomes > > better with Linux 3.16. > > > > Again, Canonical, please, say something about this. > > > > As I said, I'm a huge fan of Ubuntu and I'm waiting to see what Canonical > > will do about this.... Canonical, your turn. > > Running v3.16 is expected to work on 14.04 userspace but it is not a > recommended configuration at this time. That said, in our testing v3.16 > does not appear to trigger the same issues. Confirmation of this on your > setup would be a useful additional data point. Please do report any > testing of this nature back on your original bug so it can be collated > with the rest. > > Be assured that people are looking at these issues as a matter of urgency. > > -apw >
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