[PVE-User] Performance Lag in Recent OpenVZ kernels

Keith Osborne keith at tdrnetworks.com
Tue Apr 9 12:48:38 CEST 2013


Is anyone aware of major performance problems in the latest OpenVZ 
kernels - I just posted a bugzilla report here with a ton of graphs:


I went from Debian 6 (excellent performance) stock kernel to Centos 6.4 
(terrible with ksoftirqd bug also report - 
https://bugzilla.openvz.org/show_bug.cgi?id=2554) latest VZ kernel to 
Debian 6 Proxmox kernel (also contains ksoftirqd bug) - both latest VZ 
kernels for CentOS and Proxmox were awful in performance - something was 
eating up all the CPU in user, but top show only small CPU usage inside 
the containers.  Back to Debian 6 stock with a kernal circa 2011 and 
performance is flying again.

I checked all the usual suspects, RAID configuration, deadline 
scheduler, blockdev size - over just a major lag - perhaps people don't 
notice it or perhaps it's a known problem?  Does anyone else have this 
experience of coming from the older Debian 6 vanilla kernel?


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