From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: [PATCH 0/8] KVM updates for 2.6.20-rc2
Date: Thu, 28 Dec 2006 15:07:42 +0100 [thread overview]
Message-ID: <20061228140742.GA10033@elte.hu> (raw)
In-Reply-To: <4593CD74.6060202-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
* Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> >yeah. Would be nice to see some hard numbers about how many cycles all
> >these context load/save variants take.
>
> PIO latency on AMD (including a trip to qemu and back) is 5500 cycles
> [1]. Intel is significantly higher.
>
> [1] http://virt.kernelnewbies.org/KVM/Performance
ok. We need the IPI only on VMX, right? That's because it has cached VM
state in the CPU that needs to be flushed out to the public VM area
before it can be loaded into another CPU, correct? Is there no cheap way
to do this flushing preemptively (say in vcpu_put()), to make the VM
context potentially loadable into another CPU?
Ingo
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next prev parent reply other threads:[~2006-12-28 14:07 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-28 10:07 [PATCH 0/8] KVM updates for 2.6.20-rc2 Avi Kivity
2006-12-28 10:08 ` [PATCH 1/8] KVM: Use boot_cpu_data instead of current_cpu_data Avi Kivity
2006-12-28 10:09 ` [PATCH 2/8] KVM: Simplify is_long_mode() Avi Kivity
2006-12-28 10:12 ` [PATCH 5/8] KVM: Move common msr handling to arch independent code Avi Kivity
2006-12-28 10:13 ` [PATCH 6/8] KVM: More msr misery Avi Kivity
[not found] ` <45939755.7010603-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 10:10 ` [PATCH 3/8] KVM: Initialize kvm_arch_ops on unload Avi Kivity
2006-12-28 10:11 ` [PATCH 4/8] KVM: Implement a few system configuration msrs Avi Kivity
[not found] ` <20061228101117.65A392500F7-LjA0eNSCdXrQnzwC+xcbyw@public.gmane.org>
2007-01-01 0:07 ` Ingo Oeser
[not found] ` <200701010107.18008.ioe-lkml-MFZNYGWX9eyELgA04lAiVw@public.gmane.org>
2007-01-01 8:20 ` Avi Kivity
2006-12-28 10:14 ` [PATCH 7/8] KVM: Rename some msrs Avi Kivity
2006-12-28 10:15 ` [PATCH 8/8] KVM: Fix oops on oom Avi Kivity
2006-12-28 10:33 ` [PATCH 0/8] KVM updates for 2.6.20-rc2 Ingo Molnar
[not found] ` <20061228103345.GA4708-X9Un+BFzKDI@public.gmane.org>
2006-12-28 11:04 ` Avi Kivity
[not found] ` <4593A4B7.2070404-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 11:23 ` Ingo Molnar
[not found] ` <20061228112356.GA14386-X9Un+BFzKDI@public.gmane.org>
2006-12-28 12:21 ` Avi Kivity
2006-12-28 13:15 ` Ingo Molnar
2006-12-28 11:30 ` Ingo Molnar
[not found] ` <20061228113038.GA16190-X9Un+BFzKDI@public.gmane.org>
2006-12-28 12:32 ` Avi Kivity
[not found] ` <4593B948.5090009-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 13:37 ` Ingo Molnar
[not found] ` <20061228133746.GC3392-X9Un+BFzKDI@public.gmane.org>
2006-12-28 13:49 ` Avi Kivity
[not found] ` <4593CB61.5050709-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 13:50 ` Ingo Molnar
[not found] ` <20061228135020.GA7606-X9Un+BFzKDI@public.gmane.org>
2006-12-28 13:58 ` Avi Kivity
[not found] ` <4593CD74.6060202-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 14:07 ` Ingo Molnar [this message]
[not found] ` <20061228140742.GA10033-X9Un+BFzKDI@public.gmane.org>
2006-12-28 14:18 ` Avi Kivity
[not found] ` <4593D243.1030301-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 15:01 ` Ingo Molnar
[not found] ` <20061228150104.GB16057-X9Un+BFzKDI@public.gmane.org>
2006-12-28 15:09 ` Avi Kivity
[not found] ` <4593DE1D.8010701-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 15:11 ` Ingo Molnar
[not found] ` <20061228151159.GA20279-X9Un+BFzKDI@public.gmane.org>
2006-12-28 15:25 ` Avi Kivity
[not found] ` <4593E1E3.2020800-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2006-12-28 15:28 ` Avi Kivity
2006-12-28 12:42 ` [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create_vcpu() Ingo Molnar
2006-12-28 12:56 ` Avi Kivity
2006-12-28 12:55 ` Ingo Molnar
[not found] ` <20061228125544.GA31207-X9Un+BFzKDI@public.gmane.org>
2006-12-28 13:08 ` [patch, try#2] " Ingo Molnar
2006-12-28 13:14 ` Avi Kivity
2006-12-28 13:23 ` Ingo Molnar
2006-12-28 13:30 ` Avi Kivity
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