linux-kernel - Re: [PATCH RFC] kvm: x86: add halt

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Message-ID: <54D3C210.8030108@redhat.com>
Date:	Thu, 05 Feb 2015 20:18:40 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, riel@...hat.com,
	mtosatti@...hat.com
Subject: Re: [PATCH RFC] kvm: x86: add halt_poll module parameter



On 05/02/2015 18:53, Radim Krčmář wrote:
> >            99% of what you get if you use idle=poll in the guest.
> 
> (Hm, I would have thought that this can outperform idle=poll ...)

It outperforms idle=poll in the host.  A vmexit is probably too cheap to
outperform having idle=poll in the guest.

Paolo
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