On 09/01/2009 09:12 PM, Andrew Theurer wrote:
Here's a run from branch debugreg with thread debugreg storage +
conditionally reload dr6:
user nice system irq softirq guest idle iowait
5.79 0.00 9.28 0.08 1.00 20.81 58.78 4.26
total busy: 36.97
Previous run that had avoided calling adjust_vmx_controls twice:
user nice system irq softirq guest idle iowait
5.81 0.00 9.48 0.08 1.04 21.32 57.86 4.41
total busy: 37.73
A relative reduction CPU cycles of 2%
That was an wasy fruit to pick. To bad it was a regression that we
introduced.
new oprofile:
samples % app name symbol name
876648 54.1555 kvm-intel.ko vmx_vcpu_run
37595 2.3225 qemu-system-x86_64 cpu_physical_memory_rw
35623 2.2006 qemu-system-x86_64 phys_page_find_alloc
24874 1.5366 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 native_write_msr_safe
17710 1.0940 libc-2.5.so memcpy
14664 0.9059 kvm.ko kvm_arch_vcpu_ioctl_run
14577 0.9005 qemu-system-x86_64 qemu_get_ram_ptr
12528 0.7739 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 native_read_msr_safe
10979 0.6782 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 copy_user_generic_string
9979 0.6165 qemu-system-x86_64 virtqueue_get_head
9371 0.5789 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 schedule
8333 0.5148 qemu-system-x86_64 virtqueue_avail_bytes
7899 0.4880 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 fget_light
7289 0.4503 qemu-system-x86_64 main_loop_wait
7217 0.4458 qemu-system-x86_64 lduw_phys
This is almost entirely host virtio. I can reduce native_write_msr_safe
by a bit, but not much.
6821 0.4214 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 audit_syscall_exit
6749 0.4169 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 do_select
5919 0.3657 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 audit_syscall_entry
5466 0.3377 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 kfree
4887 0.3019 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 fput
4689 0.2897 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 __switch_to
4636 0.2864 vmlinux-2.6.31-rc5_debugreg_v2.6.31-rc3-3441-g479fa73-autokern1 mwait_idle
Still not idle=poll, it may shave off 0.2%.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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