On Sun, Jul 4, 2010 at 06:42, Pascal J. Bourguignon <p...@informatimago.com> wrote: > p...@informatimago.com (Pascal J. Bourguignon) writes: > >> I've got various Qemu running linux (gentoo or debian, all running the >> same kernel). On one of them, I get very irregular response time. >> >> During a few seconds, it works normally. Eg. thru a ssh connection, I >> can type commands at bash, and I get the character echoed right away. >> And then, for a few tens of seconds, it hangs, with no output and no >> way to interrupt it or whatever. The qemu process is in S state, >> waiting in poll_s WCHAN.
Did you notice the qemu or kvm version? Also, is it happen in pure qemu or qemu utilizing kvm? or both? I somewhat "smell" buggy spurious interrupt handling..... try to set your processor to use constant clock frequency. And....few month ago, I learned quite funny tricks. Sometimes qemu/kvm window hangs if I place it on different workspace other than my current workspace in my GNOME desktop. Moving out focus from Qemu's workspace somehow make it hang for few seconds (qemu-kvm 0.10.6). So, the trick is, always place it on your current active workspace. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
