[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-users] poor IO performance with dom0 on centos7

  • To: Xen-users@xxxxxxxxxxxxx
  • From: Christoph <mangel@xxxxxx>
  • Date: Tue, 01 Sep 2015 06:11:18 +0200
  • Delivery-date: Tue, 01 Sep 2015 04:12:29 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

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 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)


Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.