i tried the command "echo 0 > /sys/devices/system/cpu/cpu1/online", but after that the console was halt, and sometimes system was halt. no message left in "xm dmesg" "dmesg" "/var/log/xen/xen-hotplug.log" xen version i used is 4.0.1-rc2, the domU kernel is xenified linux-2.6.31.8 and also i did an experiment without xen on linux-2.6.31.8(the config is just without xen options), the command above can work how can i unplug a physical cpu on xen? is that not supported by xen yet? i'm a newer to this field, maybe just a simple question, please help ------------------ qiangwang Key Laboratory of Service Computing Technology and System Key Laboratory of Cluster and Grid Computing School of Computer Science and Technology Huazhong University of Science and Technology Wuhan, 430074, P.R. China E-mail:qw.hust@gmail.com _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel