Re: [Xen-users] DomU better performance than Dom0

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

The benchmark I used is called UnixBench.

--John

jian zhang wrote:
> Hi:
> I also want to measure the performance of Xenlinux, but I don't know 
> which tools to use, would you please tell me which tool you used for the 
> following results.
> Thank you very much!!
>
> 2007/7/31, John T. Yocum <john@xxxxxxxxxxxxxxxx 
> <mailto: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
>
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