linux-kernel - Re: [PATCH v3 4/7] KVM: VMX: dynamise PLE window

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Message-ID: <53F65738.10000@redhat.com>
Date:	Thu, 21 Aug 2014 22:31:52 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Radim Krčmář 
	<rkrcmar@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>,
	Vinod Chegu <chegu_vinod@...com>,
	Hui-Zhi Zhao <hui-zhi.zhao@...com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Lisa Mitchell <lisa.mitchell@...com>
Subject: Re: [PATCH v3 4/7] KVM: VMX: dynamise PLE window

Il 21/08/2014 21:10, Raghavendra K T ha scritto:
> 2. can we consider min_ple_window value of 2k. tracing showed that in
> overcommit there were several occations of 4k <- 4k situations.

Yes, that could be good now that we have adaptive exits.  Perhaps even 1k.

> 3. Do you think using ( << and >> ) instead of (*, /) saves some cycles
> considering we could have potentially have grow,shrink numbers != power
> of 2

* is very fast. / a bit less so but it never occurs with the defaults.
So I think it's okay.  I'm not sure why one would use a multiplier
bigger than 2.

Paolo
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