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

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

Any thoughts on this?

Thanks,
John

John T. Yocum wrote:
> 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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