[CentOS-virt] poor performance with dom0 on centos7
pasik at iki.fi
Wed Sep 2 08:22:03 UTC 2015
On Tue, Sep 01, 2015 at 06:47:18AM +0200, Christoph wrote:
> Hi All
> 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
> It is better now but still significantly worse than with centos6 dom0
> 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 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)
You forgot to mention the most important thing.. what kind of performance numbers are you seeing? What are you expecting?
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