[Xen-users] (no subject)

["juzi0730" <juzi0730@xxxxxxxx>]

Hi,

 

I have some questions about schedulers in Xen 3.1.0.

 

These days I have performed some experiments to examine the impact of scheduler parameters on the performance application.

But to my surprise, the results are not consistent with some instructions in many papers.

I used the credit scheduler, and two guest domains, one ran an I/O intensive application, and a CPU intensive application ran in another domain. I found that the performance of my i/o intensive application was severely influenced by the cpu intensive domain.

As many documents said, if using the credit scheduler, I/O intensive domain will preempt CPU intensive ones immediately when they become runnable. They will not wait a full time slice. Well, why my i/o intensive application was severely influenced by the CPU intensive domain, the performance was worse obviously?

 

regards,

Sharon

 

2008-08-27

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juzi0730

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