BIOS has now been updated # sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2.1c 04/22/2014
I've been able to reproduce the problem using a fresh Windows 2008R2 server image. The guest functions correctly for a period of time then starts to 'freeze' for around 10 seconds every 5-20 seconds. While frozen the CPU usage of QEMU jumps to around 105%. Attached is the updated perf record. 11.74% qemu-system-x86 [kernel.kallsyms] [k] flush_tlb_page 6.27% qemu-system-x86 [kernel.kallsyms] [k] kvm_handle_hva_range 4.98% qemu-system-x86 [kernel.kallsyms] [k] __srcu_read_lock 4.76% qemu-system-x86 [kernel.kallsyms] [k] try_to_unmap_ksm 4.62% qemu-system-x86 [kernel.kallsyms] [k] _raw_spin_unlock 4.30% qemu-system-x86 [kernel.kallsyms] [k] up_read 4.05% qemu-system-x86 [kernel.kallsyms] [k] down_read 3.97% qemu-system-x86 [kernel.kallsyms] [k] try_to_unmap_one 3.85% qemu-system-x86 [kernel.kallsyms] [k] generic_exec_single 3.72% qemu-system-x86 [kernel.kallsyms] [k] _raw_spin_lock 3.45% qemu-system-x86 [kernel.kallsyms] [k] __srcu_read_unlock 3.18% qemu-system-x86 [kernel.kallsyms] [k] mm_find_pmd 3.00% qemu-system-x86 [kernel.kallsyms] [k] rmap_walk_ksm 2.90% qemu-system-x86 [kernel.kallsyms] [k] cpumask_any_but 2.87% qemu-system-x86 [kernel.kallsyms] [k] remove_migration_pte 2.25% qemu-system-x86 [kernel.kallsyms] [k] __anon_vma_interval_tree_subtree_search 1.64% qemu-system-x86 [kernel.kallsyms] [k] kvm_unmap_rmapp ** Attachment added: "perf.data" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1322441/+attachment/4119371/+files/perf.data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1322441 Title: QEMU Windows guest unstable after random amount of time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1322441/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
