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

Takuya Yoshikawa
2011-06-08T03:07:53Z

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