On 01/10/2014 12:32 PM, Josh Boyer wrote:
On Thu, Jan 9, 2014 at 5:28 PM, Karanbir Singh mail-lists@karan.org wrote:
On 01/09/2014 02:22 PM, Josh Boyer wrote:
OK, but it's still a kernel based on the RHEL kernel, just with the changes/additions backported to it. It isn't a bump to e.g. the Linux 3.10 stable release or something. Correct?
the xen4centos kernel is mainline based 3.x
Interesting. I'll have a look. Do you know or have pointers to why they chose to go that route?
We tried, quite a bit, to try and get the xen stuff backported into the 2.6.32-EL6 kernel, but given the patch overlap was something we cant control and lack the time and technical depth in kernel code to maintain that longer term ( this was essentially Johnny and me, doing this over and above most other things ), it was just easier to go down that route.
Secondly, there are quite a few anecdotal pieces on dramatic performance improvements in newer kernels, I know atleast one of the top 5 CDN's ( ie carry > 25Gibt/sec ) that recently switched over from the distro centos kernel to a inhouse 3.10 build for 'network perforamnce'.
In quotes, because repeated questions and pokes in various media have failed to get a reasonable, tangiable, technical response out of them beyond 'network perforamance'.
- KB