it is possible to tune dom0/domU for better IO/network performance?
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 http://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance It is better now but still significantly worse than with CentOS6 dom0
xen parameter: dom0_mem24M cpufreq=xen dom0_max_vcpus=2
xl sched-credit Cpupool Pool-0: tslice0ms ratelimit00us 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 or try?
could it be a selinux issue? I have it in permissive mode there, not disabled. But permissive means only to collect the info not enforcing the rules…
(I use the xen45 pkgs)