I've rebootet the machine on 04.05. with the given options (acpi=1 apic=1). The kernel complains about "malformed early option" on this (see attached dmesg output).
acpi_available returns 1, so at least acpi ist not available on this machine. ** Attachment added: "dmesg output after adding acpi=1 apic=1" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/751253/+attachment/2125244/+files/dmesg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/751253 Title: Many interrupts and slow disk I/O on Lucid xen guest -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs