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| From: | Peter Lieven |
| Subject: | Re: [Qemu-devel] win7 bad i/o performance, high insn_emulation and exists |
| Date: | Tue, 21 Feb 2012 12:16:16 +0100 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110921 Thunderbird/3.1.15 |
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
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Gleb.
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