Thanks Ben - that's a very helpful run-down. Should we try to change that wiki page?
-Peter On Tue, Jun 16, 2015 at 12:58 PM, Ben Howard <[email protected]> wrote: > The HWE kernels were originally targeted for hardware enablement. The > reason for suggesting that they are not viable for cloud use, is in > part, because of stability, support and virtual hardware was assumed to > be fairly static. However, we are seeing that the HWE kernels are quite > viable in cloud, that the assumption of static hypervisors was false, > and that people need newer kernel features on older userlands (Docker, > cgroups, file systems, etc). > > By default GCE, Azure, and VMware Air, use the HWE enablement kernels at > the request of the Clouds. Incidentally, I am in the process of > releasing HWE builds for Trusty in the upstream images [1]. I expect to > have AWS EC2 image availability later this week. > > The biggest problem with HWE kernels is that they have a shorter life > cycle (i.e. 14.04's hwe-{u,v,w} series will only live for 9 months). So > if you elect to use an HWE kernel, be aware that you may have to switch > off of it later to get bug fixes. > > For 12.04, linux-image-generic-lts-trusty is supported for the remaining > life of 12.04. The generic kernel is -virtual with a larger set of > modules; it is fine to install on virtual targets. > > For 14.04, linux-image-hwe-virtual-trusty will pull in the latest > supported hwe-kernel (and auto-upgrade you). > > ~Ben > > [1] https://cloud-images.ubuntu.com/trusty > > On 06/16/2015 08:42 AM, Peter Wolanin wrote: > > > > Ubuntu offers package for 12.04 like linux-image-3.13.0-55-generic > > 3.13.0-55.92~precise1 that upgrade the kernel version. > > > > However, this wiki page says these kernels should not be used for > > Cloud deployments: > > https://wiki.ubuntu.com/Kernel/LTSEnablementStack > > > > I also note that there is no -virtual version of the kernel upgrade > > package. > > > > Is that note overly cautious, or are there real risks in trying to > > switch to the upgraded kernel? We are motivated by fixes for xfs > > problems we are seeing when using the default 12.04 kernel on AWS. > > > > Thanks, > > > > -Peter > > > > -- > > Peter M. Wolanin, Ph.D. : Momentum Specialist, Acquia. Inc. > > [email protected] <mailto:[email protected]> : > 609-235-6869 > > > > > > -- > > > Ben Howard > [email protected] > Canonical > GPG ID 0x5406A866 > > > > > -- > Ubuntu-cloud mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/ubuntu-cloud > > -- Peter M. Wolanin, Ph.D. : Momentum Specialist, Acquia. Inc. [email protected] : 609-235-6869
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