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

To: jian zhang <cheechuang@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] DomU better performance than Dom0
From: "John T. Yocum" <john@xxxxxxxxxxxxxxxx>
Date: Tue, 31 Jul 2007 06:36:44 -0700
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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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