Nakajima, Jun wrote:
On 4/29/2009 7:41:50 AM, Andrew Theurer wrote:
I wanted to share some performance data for KVM and Xen. I thought it
would be interesting to share some performance results especially
compared to Xen, using a more complex situation like heterogeneous
server consolidation.
The Workload:
The workload is one that simulates a consolidation of servers on to a
single host. There are 3 server types: web, imap, and app (j2ee). In
addition, there are other "helper" servers which are also
consolidated: a db server, which helps out with the app server, and an
nfs server, which helps out with the web server (a portion of the docroot is
nfs mounted).
There is also one other server that is simply idle. All 6 servers
make up one set. The first 3 server types are sent requests, which in
turn may send requests to the db and nfs helper servers. The request
rate is throttled to produce a fixed amount of work. In order to
increase utilization on the host, more sets of these servers are used.
The clients which send requests also have a response time requirement
which is monitored. The following results have passed the response
time requirements.
The host hardware:
A 2 socket, 8 core Nehalem with SMT, and EPT enabled, lots of disks, 4
x
1 GB Ethenret
The host software:
Both Xen and KVM use the same host Linux OS, SLES11. KVM uses the
2.6.27.19-5-default kernel and Xen uses the 2.6.27.19-5-xen kernel. I
have tried 2.6.29 for KVM, but results are actually worse. KVM
modules are rebuilt with kvm-85. Qemu is also from kvm-85. Xen
version is "3.3.1_18546_12-3.1".
The guest software:
All guests are RedHat 5.3. The same disk images are used but
different kernels. Xen uses the RedHat Xen kernel and KVM uses 2.6.29
with all paravirt build options enabled. Both use PV I/O drivers. Software
used:
Apache, PHP, Java, Glassfish, Postgresql, and Dovecot.
Just for clarification. So are you using PV (Xen) Linux on Xen, not HVM? Is
that 32-bit or 64-bit?
PV, 64-bit.
-Andrew
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