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Date: Tue, 15 May 2018 09:09:29 +0100
From: Wei Liu <wei.liu2@citrix.com>
To: Weiwei Jia <harrynjit@gmail.com>
CC: <linux-kernel@vger.kernel.org>, <xen-devel@lists.xenproject.org>,
        Weiwei Jia <harryxiyou@gmail.com>, <jianchen.shan@gmail.com>,
        <kvm@vger.kernel.org>, <dingxn@gmail.com>,
        Wei Liu <wei.liu2@citrix.com>
Subject: Re: [Xen-devel] [RFC][PATCH] KVM: APPLES can improve the performance
 of applications and virtualized systems by up to 49%
Message-ID: <20180515080929.rkqmmumjoxtlqctd@citrix.com>
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On Sat, May 12, 2018 at 04:27:04PM +0800, Weiwei Jia wrote:
> Dear all,
> 
> Recently, we made a few improvements on effectively utilizing Pause
> Loop Exiting (PLE) support for higher throughput on virtualized
> systems. Basically, it solves two problems: 1) how to adjust
> PLE_Window; 2) how to select virtual CPUs to schedule on VM_EXITs
> caused by PLE. Our tests with standard benchmarks show that the
> approach can improve performance by up to 49%. The approach shows
> promising performance and is easy to implement. We think that it would
> be wonderful if Linux/KVM and XEN can consider the approach.
> 
> We already have a prototype implementation based on KVM (Linux Kernel
> 3.19.8). Our patch for Linux Kernel 3.19.8 and the paper describing
> our idea are available in Github repository [1][2][3]. We are pleased
> to revise our patch in order to merge it into Linux/KVM and XEN. We
> hope that you can test and adopt our approach/techniques. We are
> pleased to get some comments/suggestions on the approach and on how
> the idea can be adopted/tested by Linux/KVM and XEN. Thank you.
> 
> [1] APPLES paper: https://github.com/sysmen/apples/tree/master/paper
> [2] APPLES patch:
> https://github.com/sysmen/apples/blob/master/patches/3.19.8-APPLES.patch
> [3] APPLES patch README:
> https://github.com/sysmen/apples/blob/master/patches/README.txt
> 

Is PV spinlock involved in your test? There is no mention of it in your
paper.

Wei.

> Best Regards,
> Sysmen Research Group
> 
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