From: Paolo Bonzini <pbonzini@redhat.com>
To: "Raghavendra K T" <raghavendra.kt@linux.vnet.ibm.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Gleb Natapov <gleb@kernel.org>, Vinod Chegu <chegu_vinod@hp.com>,
Hui-Zhi Zhao <hui-zhi.zhao@hp.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Lisa Mitchell <lisa.mitchell@hp.com>
Subject: Re: [PATCH v3 4/7] KVM: VMX: dynamise PLE window
Date: Thu, 21 Aug 2014 22:31:52 +0200 [thread overview]
Message-ID: <53F65738.10000@redhat.com> (raw)
In-Reply-To: <53F6440B.8010709@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2014-08-21 20:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-21 16:08 [PATCH v3 0/7] Dynamic Pause Loop Exiting window Radim Krčmář
2014-08-21 16:08 ` [PATCH v3 1/7] KVM: add kvm_arch_sched_in Radim Krčmář
2014-08-21 18:49 ` Raghavendra K T
2014-08-21 20:31 ` Radim Krčmář
2014-08-21 21:12 ` Paolo Bonzini
2014-08-21 16:08 ` [PATCH v3 2/7] KVM: x86: introduce sched_in to kvm_x86_ops Radim Krčmář
2014-08-21 18:50 ` Raghavendra K T
2014-08-21 16:08 ` [PATCH v3 3/7] KVM: VMX: make PLE window per-VCPU Radim Krčmář
2014-08-21 18:52 ` Raghavendra K T
2014-08-21 16:08 ` [PATCH v3 4/7] KVM: VMX: dynamise PLE window Radim Krčmář
2014-08-21 19:10 ` Raghavendra K T
2014-08-21 20:31 ` Paolo Bonzini [this message]
2014-08-21 20:59 ` Radim Krčmář
2014-08-21 16:08 ` [PATCH v3 5/7] KVM: trace kvm_ple_window grow/shrink Radim Krčmář
2014-08-25 13:53 ` Sabrina Dubroca
2014-08-25 14:32 ` Radim Krčmář
2014-08-25 14:44 ` Paolo Bonzini
2014-08-21 16:08 ` [PATCH v3 6/7] KVM: VMX: runtime knobs for dynamic PLE window Radim Krčmář
2014-08-21 19:17 ` Raghavendra K T
2014-08-21 21:03 ` Radim Krčmář
2014-08-21 16:08 ` [PATCH v3 7/7] KVM: VMX: optimize ple_window updates to VMCS Radim Krčmář
2014-08-21 19:18 ` Raghavendra K T
2014-08-21 16:30 ` [PATCH v3 0/7] Dynamic Pause Loop Exiting window Paolo Bonzini
2014-08-21 16:50 ` Radim Krčmář
2014-08-21 16:53 ` Paolo Bonzini
2014-08-22 4:45 ` Wanpeng Li
2014-08-25 15:11 ` Radim Krčmář
2014-08-25 15:11 ` Radim Krčmář
2014-08-21 17:03 ` Raghavendra K T
2014-08-21 18:40 ` Raghavendra K T
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