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
