Recently there were some changes in Ubuntu:With the release of 12.04.2 it seems new installs from cd/dvd will use the lts-quantal kernel 3.5 from Ubuntu 12.10 by default..... however apt-get upgrade and dist-upgrade will continue to default to the old 3.2 kernel. The 3.5 kernel will enjoy the same support the 3.2 kernel had, but the 3.5 kernel will only be supported until the next LTS release 14.04 while the 3.2 kernel will be supported for the full 5 years. Canonical recommends to leave VMs and cloud installs at 3.2.
https://wiki.kubuntu.org/Kernel/LTSEnablementStack
Since we want to keep our Scientific Computing stack fresh this would mean that we upgrade to 14.04 next year. This puts one question on the table: Do we want to upgrade our current compute systems to kernel 3.5 or stay on 3.2?
Not yet sure if there are any direct benefits other than better support for the Micron SSD controller in the Dell R720 hardware we use. One that I could see is that it supports tcp connection repair which is useful for HPC checkpointing.
Another interesting feature is improved performance debugging.
http://kernelnewbies.org/Linux_3.5#head-95fccbb746226f6b9dfa4d1a48801f63e11688de
and a network priority cgroup:
http://kernelnewbies.org/Linux_3.3#head-f0a57845639c0fbc242438e4cb76d44d1f103c24
we would probably leave most of our virtual systems on kernel 3.2 to enjoy the full 5 year support, our desktop deployment should may be go to 3.5 if the hardware requires it.
Sunday, February 17, 2013
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