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

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Date:	Wed, 08 Jun 2011 11:25:42 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
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 06/08/2011 11:11 AM, Takuya Yoshikawa wrote:
> 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.
> 

Um, which case did you test? ept = 1 or ept=0 bypass_guest_pf=0 or both?

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

Sure, KVM guest is the client, and it uses e1000 NIC, and uses NAT
network connect to the netperf server, the bandwidth of our network
is 100M.

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