[Xen-users] DomU better performance than Dom0

["John T. Yocum" <john@xxxxxxxxxxxxxxxx>]

Hello!

I've got an interesting performance problem, I'm running Xen 3.1 on a 
Dell with 2 x Quad-core 2.33Ghz CPUs, and 4GB RAM. Running UnixBench on 
the system without Xen the performance is pretty good, but once running 
Xen the performance drops by a large amount.
Any insight into why the score is so much lower with Xen would be 
appreciated. (UnixBench scores at bottom)
Thanks,
John

CentOS 5 without Xen

                     INDEX VALUES
TEST                                        BASELINE     RESULT      INDEX

Dhrystone 2 using register variables        376783.7 52116444.7     1383.2
Double-Precision Whetstone                      83.1     2612.0      314.3
Execl Throughput                               188.3    11429.1      607.0
File Copy 1024 bufsize 2000 maxblocks         2672.0   155443.0      581.7
File Copy 256 bufsize 500 maxblocks           1077.0    37493.0      348.1
File Read 4096 bufsize 8000 maxblocks        15382.0  1475439.0      959.2
Pipe-based Context Switching                 15448.6   548465.7      355.0
Pipe Throughput                             111814.6  3313637.0      296.4
Process Creation                               569.3    34050.6      598.1
Shell Scripts (8 concurrent)                    44.8     3566.8      796.2
System Call Overhead                        114433.5  2756155.3      240.9
                                                                 =========
     FINAL SCORE                                                     510.9

CentOS 5 Dom0

                     INDEX VALUES
TEST                                        BASELINE     RESULT      INDEX

Dhrystone 2 using register variables        376783.7 50864253.7     1350.0
Double-Precision Whetstone                      83.1     2617.9      315.0
Execl Throughput                               188.3     2786.5      148.0
File Copy 1024 bufsize 2000 maxblocks         2672.0   159749.0      597.9
File Copy 256 bufsize 500 maxblocks           1077.0    44884.0      416.8
File Read 4096 bufsize 8000 maxblocks        15382.0  1191772.0      774.8
Pipe-based Context Switching                 15448.6   306121.8      198.2
Pipe Throughput                             111814.6  1417645.2      126.8
Process Creation                               569.3     4699.2       82.5
Shell Scripts (8 concurrent)                    44.8      781.6      174.5
System Call Overhead                        114433.5  1021813.7       89.3
                                                                 =========
     FINAL SCORE                                                     261.6

CentOS 5 DomU

                     INDEX VALUES
TEST                                        BASELINE     RESULT      INDEX

Dhrystone 2 using register variables        376783.7 38015133.3     1008.9
Double-Precision Whetstone                      83.1     2023.4      243.5
Execl Throughput                               188.3     3877.4      205.9
File Copy 1024 bufsize 2000 maxblocks         2672.0   270737.0     1013.2
File Copy 256 bufsize 500 maxblocks           1077.0    78470.0      728.6
File Read 4096 bufsize 8000 maxblocks        15382.0  1227115.0      797.8
Pipe Throughput                             111814.6  1383157.5      123.7
Pipe-based Context Switching                 15448.6   310378.3      200.9
Process Creation                               569.3     7534.8      132.4
Shell Scripts (8 concurrent)                    44.8     1179.6      263.3
System Call Overhead                        114433.5  1056362.3       92.3
                                                                 =========
     FINAL SCORE                                                     308.2

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users