From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Qiu, Michael" <michael.qiu@intel.com>
Subject: Re: [PATCH v9 0/2] Add VHOST PMD
Date: Wed, 2 Mar 2016 02:24:46 +0000
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Cc: "ann.zhuangyanying@huawei.com" <ann.zhuangyanying@huawei.com>, "Liu,
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To: Tetsuya Mukawa <mukawa@igel.co.jp>, "dev@dpdk.org" <dev@dpdk.org>
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On 3/1/2016 10:19 AM, Tetsuya Mukawa wrote:=0A=
> On 2016/03/01 11:00, Qiu, Michael wrote:=0A=
>> On 2/26/2016 4:36 PM, Tetsuya Mukawa wrote:=0A=
>>> On 2016/02/26 13:29, Tetsuya Mukawa wrote:=0A=
>>>>=0A=
=0A=
[...]=0A=
=0A=
>>>>=0A=
>>>> BTW, I have set the frontend mergeable off.=0A=
>>>> I have checked below cases.=0A=
>>>>  - Case1: Disable mergeable feature in virtio-net PMD.=0A=
>>>>  - Case2: Disable mergeable feature in virtio-net PMD and use=0A=
>>>> '--txqflags=3D0xf01' option to use simple ring deploying.=0A=
>>>> Both cases,  I still cannot see the drop.=0A=
>>>>=0A=
>>>> Anyway, I will send a few patch-series to determine the cause of drop.=
=0A=
>>>> So, could you please apply them and check the performance to determine=
=0A=
>>>> which cause the drop?=0A=
>>> Hi Michael,=0A=
>>>=0A=
>>> I may find what causes the drop.=0A=
>>> Could you please restart testpmd on guest when you see the drop, then=
=0A=
>>> check performance again?=0A=
>>>=0A=
>>> I guess the drop will occur only first time when testpmd on guest and=
=0A=
>>> host is connected.=0A=
>>> Here are rough steps.=0A=
>>>=0A=
>>> 1. Start testpmd on host=0A=
>>> 2. Start QEMU=0A=
>>> 3. Start testpmd on guest=0A=
>>>=0A=
>>> Then you will see the drop.=0A=
>>> Probably, if testpmd on guest is restarted, then you don't see the drop=
=0A=
>>> again.=0A=
>>>=0A=
>>> 4. Type 'quit' on guest.=0A=
>>> 5. Start testpmd on guest again.=0A=
> Hi Michael,=0A=
>=0A=
> I am sorry that above was caused by my miss configuration.=0A=
> So please ignore it.=0A=
> If you can have time today, could you please check v7 and v8 performance?=
=0A=
=0A=
Hi, Tetsuya=0A=
=0A=
I have tried the qemu case but seems it does not have any difference,=0A=
maybe my configuration is wrong.=0A=
=0A=
What I used to test is container case from Jianfeng.  And I make a=0A=
mistake that V6 compiled by GCC 5.3, but V9 with GCC 4.8, after using=0A=
the same compiler, the performance almost the same.=0A=
=0A=
Thanks,=0A=
Michael=0A=
=0A=
=0A=
> Thanks,=0A=
> Tetsuya=0A=
>=0A=
>> OK, I will help to tested today.=0A=
>>=0A=
>> Thanks,=0A=
>> Michael=0A=
>=0A=
=0A=