[kernel-xen] Centos7 Dom0 IO performance

Christoph Kaminski christoph at kaminski-berlin.org
Sun Aug 30 18:21:14 AEST 2015

Hi all...

since I have changed to Cenots7 dom0, I have a really poor IO 
performance inside a PV VM.

I have already done what is described on 
It is better now but still significantly worse than with centos6

my settings:

xen parameter: dom0_mem=1024M cpufreq=xen dom0_max_vcpus=2 

xl sched-credit
Cpupool Pool-0: tslice=30ms ratelimit=1000us
Name                                ID Weight  Cap
Domain-0                             0   1024    0
samael                               1    256    0
satan                                2    512    0
amon                                 3    256    0
leviathan                            4    512    0

echo 1048576 > /proc/sys/net/ipv4/tcp_limit_output_bytes on dom0

the both domU's satan and leviathan are very IO performance oriented 
(NFS server and downloading vm)

Is there something more what I can do?

(I use the xen45 pkgs)


More information about the kernel-xen mailing list