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 juzi0730 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users