BTW, I was playing with KVM few days ago and it looks pretty awesome in terms of maintaining the environment and deploying new VMs but the performance for me was really bad. And I mean extremely bad. I am not sure if it was because I made the KVM host (sles12) run as a virtual machine in z/VM or I was doing something else wrong. I know that having kvm virtual machines in a 3rd level (under sles -> under z/VM) will impact performance but my case it was extremly bad. It was like running linux in hercules s390 in 2006 on old x86 desktop.
The installation of linux in kvm virtual machine took 3-4 hours. Every operation that involves cpu and memory takes 3-10 time more time than on a KVM host itself. Whenever something is happening in kvm virtual machine, the performance toolkit shows that KVM host is doing about 50% in supervisor mode and 50% in emulation mode which makes the t/v ratio for this machine about 2 which is pretty bad. I didn’t have time to do more investigation on this yet. The KVM host (Server) sees about 50% cpu time as a “steal time”. Anyone else played with it? Thanks Gregory Powiedziuk > On Sep 22, 2015, at 8:22 AM, Dorothea Matthaeus <d...@de.ibm.com> wrote: > > Check out the new Linux on z Systems base technology publications on the > IBM Knowledge Center and on developerWorks: > > KVM Virtual Server Quick Start > KVM Virtual Server Management > Device Drivers, Features, and Commands for Linux as a KVM Guest > Installing SUSE Linux Enterprise Server 12 as a KVM Guest > > See: > > > http://www.ibm.com/support/knowledgecenter/linuxonibm/liaaf/lnz_r_kvm_base.html > > > http://www.ibm.com/developerworks/linux/linux390/documentation_dev.html > > > Dorothea Matthaeus > Linux on z Systems Information Development > IBM Deutschland Research and Development GmbH > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
