Re: win7 bad i/o performance, high insn_emulation and exists

[Peter Lieven <pl@dlh.net>]

On 21.02.2012 12:00, Gleb Natapov wrote:
> On Tue, Feb 21, 2012 at 11:59:23AM +0100, Peter Lieven wrote:
>> On 21.02.2012 11:56, Gleb Natapov wrote:
>>> On Tue, Feb 21, 2012 at 11:50:47AM +0100, Peter Lieven wrote:
>>>>> I hope it will make Windows use TSC instead, but you can't be sure
>>>>> about anything with Windows :(
>>>> Whatever it does now it eates more CPU has almost equal
>>>> number of exits and throughput is about the same (15MB/s).
>>>> If pmtimer is at 0xb008 it still reads it like hell.
>>>>
>>>> I checked with bcedit /v that useplatformclock is set to "No".
>>> Yeah, today I noticed that it is likely virtio drivers that hammer
>>> on PM timer (at least rip of the instruction that access it is
>>> very close to rip of the instruction that access virtio pio).
>>> Vadim, Windows driver developer,  is CCed.
>> Ok, I will switch to IDE and e1000 to confirm this? Or does it not
>> make sense?
>>
> It make perfect sense! Please try it.
~10MB/s. still a lot of 0xb008 reads.

efer_reload                    0         0
exits                    4389875     72341
fpu_reload                 36729       342
halt_exits                206204      3451
halt_wakeup               212953      3474
host_state_reload        2976799     59043
hypercalls                     0         0
insn_emulation           2936091     54921
insn_emulation_fail            0         0
invlpg                         0         0
io_exits                 1821386     14108
irq_exits                  81999      2798
irq_injections            343720      8560
irq_window                 12712       153
largepages                   754         2
mmio_exits                    37         0
mmu_cache_miss               148         0
mmu_flooded                    0         0
mmu_pde_zapped                 0         0
mmu_pte_updated                0         0
mmu_pte_write                  0         0
mmu_recycled                   0         0
mmu_shadow_zapped            189         0
mmu_unsync                     0         0
nmi_injections                 0         0
nmi_window                     0         0
pf_fixed                  139461        21
pf_guest                       0         0
remote_tlb_flush             248         0
request_irq                    0         0
signal_exits                   0         0
tlb_flush                  15366         0

trace at http://82.141.21.156/report3.txt.gz

Peter
> --
> 			Gleb.