From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
To: avi@redhat.com, mtosatti@redhat.com
Cc: kvm@vger.kernel.org, takuya.yoshikawa@gmail.com
Subject: Re: [PATCH-v2 0/4] KVM: dirty logging optimization
Date: Thu, 25 Nov 2010 18:48:27 +0900 [thread overview]
Message-ID: <4CEE30EB.80600@oss.ntt.co.jp> (raw)
In-Reply-To: <20101122144055.f5e36522.yoshikawa.takuya@oss.ntt.co.jp>
(2010/11/22 14:40), Takuya Yoshikawa wrote:
> ===
I'm going to do additional measurements this weekend.
- Especially with NPT.
If you have any request about which cases you want to see,
please let me know!
Thanks,
Takuya
> Test
>
> - On core 2 duo machine (without EPT)
> => just because there was already test environment.
> - 1GB RAM for the guest
> - Workloads:
> x11perf for frame buffer test
> "find /" loop for live-migration test
>
> - Time was measured by rdtscll
> kvm mask: our method
> kvm orig: original method
>
>
> a) Frame buffer
> ---------------------------------------------------------------
>
> kernel: [ 5584.954209] kvm: nr_dirty_pages/npages = 8/4096
> kernel: [ 5584.954240] kvm mask: time(tsc) = 9485
>
> kernel: [ 5992.185125] kvm: nr_dirty_pages/npages = 7/4096
> kernel: [ 5992.185389] kvm orig: time(tsc) = 444724
>
> 45 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5588.330585] kvm: nr_dirty_pages/npages = 80/4096
> kernel: [ 5588.330623] kvm mask: time(tsc) = 16688
>
> kernel: [ 5996.183982] kvm: nr_dirty_pages/npages = 80/4096
> kernel: [ 5996.184275] kvm orig: time(tsc) = 495551
>
> 30 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5578.156641] kvm: nr_dirty_pages/npages = 195/4096
> kernel: [ 5578.156690] kvm mask: time(tsc) = 27335
>
> kernel: [ 5985.109688] kvm: nr_dirty_pages/npages = 195/4096
> kernel: [ 5985.109820] kvm orig: time(tsc) = 194530
>
> 7 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5605.821017] kvm: nr_dirty_pages/npages = 375/4096
> kernel: [ 5605.821077] kvm mask: time(tsc) = 35049
>
> kernel: [ 6014.627767] kvm: nr_dirty_pages/npages = 375/4096
> kernel: [ 6014.628190] kvm orig: time(tsc) = 702737
>
> 20 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5573.551459] kvm: nr_dirty_pages/npages = 576/4096
> kernel: [ 5573.551532] kvm mask: time(tsc) = 46718
>
> kernel: [ 5981.486862] kvm: nr_dirty_pages/npages = 576/4096
> kernel: [ 5981.487036] kvm orig: time(tsc) = 210385
>
> 5 times faster
>
> ---------------------------------------------------------------
>
>
>
> b) Live-migration (1GB RAM)
> ---------------------------------------------------------------
>
> kernel: [ 5011.599573] kvm: nr_dirty_pages/npages = 52/261888
> kernel: [ 5011.599624] kvm mask: time(tsc) = 33712
>
> kernel: [ 4297.465401] kvm: nr_dirty_pages/npages = 50/261888
> kernel: [ 4297.465918] kvm orig: time(tsc) = 894593
>
> 25 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5009.045842] kvm: nr_dirty_pages/npages = 120/261888
> kernel: [ 5009.045940] kvm mask: time(tsc) = 50575
>
> kernel: [ 4295.438092] kvm: nr_dirty_pages/npages = 106/261888
> kernel: [ 4295.438427] kvm orig: time(tsc) = 525140
>
> 10 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5016.914031] kvm: nr_dirty_pages/npages = 251/261888
> kernel: [ 5016.914160] kvm mask: time(tsc) = 78750
>
> kernel: [ 4297.265937] kvm: nr_dirty_pages/npages = 260/261888
> kernel: [ 4297.266411] kvm orig: time(tsc) = 782446
>
> 10 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5015.717535] kvm: nr_dirty_pages/npages = 526/261888
> kernel: [ 5015.717697] kvm mask: time(tsc) = 130137
>
> kernel: [ 4295.370101] kvm: nr_dirty_pages/npages = 596/261888
> kernel: [ 4295.370589] kvm orig: time(tsc) = 644805
>
> 5 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5011.693010] kvm: nr_dirty_pages/npages = 1029/261888
> kernel: [ 5011.693177] kvm mask: time(tsc) = 219863
>
> kernel: [ 4295.760635] kvm: nr_dirty_pages/npages = 1025/261888
> kernel: [ 4295.761078] kvm orig: time(tsc) = 767333
>
> 3 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5014.805403] kvm: nr_dirty_pages/npages = 2219/261888
> kernel: [ 5014.805676] kvm mask: time(tsc) = 454314
>
> kernel: [ 4302.186712] kvm: nr_dirty_pages/npages = 1982/261888
> kernel: [ 4302.191418] kvm orig: time(tsc) = 2294187
>
> 5 times faster
>
> ---------------------------------------------------------------
>
> kernel: [ 5015.305794] kvm: nr_dirty_pages/npages = 4143/261888
> kernel: [ 5015.306291] kvm mask: time(tsc) = 847175
>
> kernel: [ 4302.068376] kvm: nr_dirty_pages/npages = 3835/261888
> kernel: [ 4302.069456] kvm orig: time(tsc) = 1855105
>
> 3 times faster
>
> ---------------------------------------------------------------
> --
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prev parent reply other threads:[~2010-11-25 9:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-22 5:40 [PATCH-v2 0/4] KVM: dirty logging optimization Takuya Yoshikawa
2010-11-22 5:42 ` [PATCH 1/4] KVM: fix race condition in kvm_mmu_slot_remove_write_access() Takuya Yoshikawa
2010-11-22 5:42 ` [PATCH 2/4] KVM: introduce helper to access lpage_info Takuya Yoshikawa
2010-11-22 5:43 ` [PATCH 3/4] KVM: count the number of dirty pages for each memslot Takuya Yoshikawa
2010-11-22 5:45 ` [RFC PATCH 4/4] KVM: selective write protection using dirty bitmap Takuya Yoshikawa
2010-11-22 5:59 ` [PATCH-v2 0/4] KVM: dirty logging optimization Takuya Yoshikawa
2010-11-25 9:48 ` Takuya Yoshikawa [this message]
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