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

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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.

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