On 08/27/2009 11:42 PM, Andrew Theurer wrote:
On Thu, 2009-08-27 at 19:21 +0300, Avi Kivity wrote:
On 08/27/2009 06:41 PM, Gleb Natapov wrote:
Don't call adjust_vmx_controls() two times for the same control.
It restores options that was dropped earlier.
Applied, thanks. Andrew, if you rerun your benchmark atop kvm.git
'next' branch, I believe you will see dramatically better results.
Yes! CPU is much lower:
user nice system irq softirq guest idle iowait
5.81 0.00 9.48 0.08 1.04 21.32 57.86 4.41
previous CPU:
user nice system irq softirq guest idle iowait
5.67 0.00 11.64 0.09 1.05 31.90 46.06 3.59
How does it compare to the other hypervisor now?
new oprofile:
samples % app name symbol name
885444 53.2905 kvm-intel.ko vmx_vcpu_run
guest mode = good
38090 2.2924 qemu-system-x86_64 cpu_physical_memory_rw
34764 2.0923 qemu-system-x86_64 phys_page_find_alloc
14730 0.8865 qemu-system-x86_64 qemu_get_ram_ptr
10814 0.6508 vmlinux-2.6.31-rc5-autokern1 copy_user_generic_string
10871 0.6543 qemu-system-x86_64 virtqueue_get_head
8557 0.5150 qemu-system-x86_64 virtqueue_avail_bytes
7173 0.4317 qemu-system-x86_64 lduw_phys
4122 0.2481 qemu-system-x86_64 ldl_phys
3339 0.2010 qemu-system-x86_64 virtqueue_num_heads
4129 0.2485 libpthread-2.5.so pthread_mutex_lock
virtio and related qemu overhead: 8.2%.
25278 1.5214 vmlinux-2.6.31-rc5-autokern1 native_write_msr_safe
12278 0.7390 vmlinux-2.6.31-rc5-autokern1 native_read_msr_safe
This will be reduced to if we move virtio to kernel context.
12380 0.7451 vmlinux-2.6.31-rc5-autokern1 native_set_debugreg
3550 0.2137 vmlinux-2.6.31-rc5-autokern1 native_get_debugreg
A lot less than before, but still annoying.
4631 0.2787 vmlinux-2.6.31-rc5-autokern1 mwait_idle
idle=halt may improve this, mwait is slow.
--
error compiling committee.c: too many arguments to function
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