- Rebase to upstream 28stab093.2 kernel (security and bug fixes RHSA-2011:1065)
- Ability to change NCPU on the fly
- Ability to destroy LVE on the fly (via API)
- Two modes to calculate load averages with ability to switch between them
- Fix for OOM/hanged task issue
- IO Priorities
- fs.proc_super_gid was added to specify group of users that can see all processes
If you have PAE, xen or Enterprise kernel -- use corresponding prefix, like: kernel-PAE, kernel-xen, kernel-ent instead of kernel
To change NCPU on the fly, use:
# lvectl set LVE_ID --ncpu N --force
--force will cause NCPU change on the fly. Please, don't use that option with kernels prior to lve0.8.42, as it can crash the system
Load Averages
CloudLinux has a modified way to calculated load averages, as processes can wait on CPU because of LVE limits, and not because of lack of CPU resources. Previously, our LA algorithm was ignoring uninterruptable
sysctl -w kernel.full_loadavg=1
Switching to that mode will cause higher load averages during high IO activity intervals. This should be useful on cPanel servers that have high IO Wait without high load average. You can always switch back by running:
sysctl -w kernel.full_loadavg=0
IO Priorities
While we still planning to release IO limits by the end of this year, this release introduces IO priorities. Each LVE is set to have IO priority of 100 by default (highest possible). You can lower that priority, causing particular LVE to be de-prioritizes IO wise. This means that if there is lack of resources on the server, that LVE will get less IO operations then other LVEs. IO Priorities work only with CFQ IO scheduler.