linux-kernel - Re: [PATCH 0/15] KVM: optimize for MMIO handled

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Message-Id: <20110608121128.2caecdb3.yoshikawa.takuya@oss.ntt.co.jp>
Date:	Wed, 8 Jun 2011 12:11:28 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 0/15] KVM: optimize for MMIO handled

On Tue, 07 Jun 2011 20:58:06 +0800
Xiao Guangrong <xiaoguangrong@...fujitsu.com> wrote:

> The performance test result:
> 
> Netperf (TCP_RR):
> ===========================
> ept is enabled:
> 
>       Before         After
> 1st   709.58         734.60
> 2nd   715.40         723.75
> 3rd   713.45         724.22
> 
> ept=0 bypass_guest_pf=0:
> 
>       Before         After
> 1st   706.10         709.63
> 2nd   709.38         715.80
> 3rd   695.90         710.70
> 

In what condition, does TCP_RR perform so bad?

On 1Gbps network, directly connecting two Intel servers,
I got 20 times better result before.

Even when I used a KVM guest as the netperf client,
I got more than 10 times better result.

Could you tell me a bit more details of your test?


> Kernbech (do not redirect output to /dev/null)
> ==========================
> ept is enabled:
> 
>       Before         After
> 1st   2m34.749s      2m33.482s
> 2nd   2m34.651s      2m33.161s
> 3rd   2m34.543s      2m34.271s
> 
> ept=0 bypass_guest_pf=0:
> 
>       Before         After
> 1st   4m43.467s      4m41.873s
> 2nd   4m45.225s      4m41.668s
> 3rd   4m47.029s      4m40.128s
> 
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