linux-kernel - Re: [PATCH 05/13] KVM: Update IRTE according to guest interrupt configuration changes

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Message-ID: <54632ECA.4070903@redhat.com>
Date:	Wed, 12 Nov 2014 10:56:26 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.com>,
	"Zhang, Yang Z" <yang.z.zhang@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>
CC:	"gleb@...nel.org" <gleb@...nel.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/13] KVM: Update IRTE according to guest interrupt configuration
 changes



On 12/11/2014 10:19, Wu, Feng wrote:
>> You can certainly backport these patches to distros that do not have
>> VFIO.  But upstream we should work on VFIO first.  VFIO has feature
>> parity with legacy device assignment, and adding a new feature that is
>> not in VFIO would be a bad idea.
>>
>> By the way, do you have benchmark results for it?  We have not been able
>> to see any performance improvement for APICv on e.g. netperf.
> 
> Do you mean benchmark results for APICv itself or VT-d Posted-Interrtups?

Especially for VT-d posted interrupts---but it'd be great to know which
workloads see the biggest speedup from APICv.

Paolo
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