[Xen-users] Dom0 vs native performance: does it look right?

[Ravikesh Chandra <rcha108@xxxxxxxxxxxxxxxxx>]

Hi folks,

Firstly I am running CentOS 5.3 with Xen 3.3.1 (gitco) and I've just
been testing the performance with the Unixbench test. What I found is
that running the test on the Dom0 (under Xen kernel) resulted in only
50% performance of native! I appreciate there is always going to be
overheads with virtualisation but I just wanted to check with the list
if these numbers were expected? If that doesn't seem normal any
suggestions on what I could look at?

Native:

TEST                                        BASELINE     RESULT      INDEX

Dhrystone 2 using register variables        376783.7 34739474.5      922.0
Double-Precision Whetstone                      83.1     1368.3      164.7
Execl Throughput                               188.3    28715.8     1525.0
File Copy 1024 bufsize 2000 maxblocks         2672.0   508398.0     1902.7
File Copy 256 bufsize 500 maxblocks           1077.0   158973.0     1476.1
File Read 4096 bufsize 8000 maxblocks        15382.0  3337799.0     2169.9
Pipe-based Context Switching                 15448.6  1703323.3     1102.6
Pipe Throughput                             111814.6  5979578.6      534.8
Process Creation                               569.3    80856.4     1420.3
Shell Scripts (8 concurrent)                    44.8     6240.0     1392.9
System Call Overhead                        114433.5  5937086.6      518.8
                                                                 =========
     FINAL SCORE                                                     985.7


Dom0:

TEST                                        BASELINE     RESULT      INDEX

Dhrystone 2 using register variables        376783.7 33159482.3      880.1
Double-Precision Whetstone                      83.1     1399.8      168.4
Execl Throughput                               188.3     8307.4      441.2
File Copy 1024 bufsize 2000 maxblocks         2672.0   269880.0     1010.0
File Copy 256 bufsize 500 maxblocks           1077.0    72967.0      677.5
File Read 4096 bufsize 8000 maxblocks        15382.0  2160271.0     1404.4
Pipe-based Context Switching                 15448.6   615502.1      398.4
Pipe Throughput                             111814.6  2306450.5      206.3
Process Creation                               569.3    16938.2      297.5
Shell Scripts (8 concurrent)                    44.8     2537.3      566.4
System Call Overhead                        114433.5  1956760.1      171.0
                                                                 =========
     FINAL SCORE                                                     448.8


Regards

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