On Tue, Sep 01, 2015 at 06:47:18AM +0200, Christoph wrote: > Hi All > Hello, > 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 > > my settings: > > xen parameter: dom0_mem=1024M cpufreq=xen dom0_max_vcpus=2 > dom0_vcpus_pin > > 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? Thanks, -- Pasi _______________________________________________ CentOS-virt mailing list CentOS-virt@xxxxxxxxxx https://lists.centos.org/mailman/listinfo/centos-virt
