Re: [PATCH v9 0/2] Add VHOST PMD

["Qiu, Michael" <michael.qiu@intel.com>]

On 3/1/2016 10:19 AM, Tetsuya Mukawa wrote:
> On 2016/03/01 11:00, Qiu, Michael wrote:
>> On 2/26/2016 4:36 PM, Tetsuya Mukawa wrote:
>>> On 2016/02/26 13:29, Tetsuya Mukawa wrote:
>>>>

[...]

>>>>
>>>> BTW, I have set the frontend mergeable off.
>>>> I have checked below cases.
>>>>  - Case1: Disable mergeable feature in virtio-net PMD.
>>>>  - Case2: Disable mergeable feature in virtio-net PMD and use
>>>> '--txqflags=0xf01' option to use simple ring deploying.
>>>> Both cases,  I still cannot see the drop.
>>>>
>>>> Anyway, I will send a few patch-series to determine the cause of drop.
>>>> So, could you please apply them and check the performance to determine
>>>> which cause the drop?
>>> Hi Michael,
>>>
>>> I may find what causes the drop.
>>> Could you please restart testpmd on guest when you see the drop, then
>>> check performance again?
>>>
>>> I guess the drop will occur only first time when testpmd on guest and
>>> host is connected.
>>> Here are rough steps.
>>>
>>> 1. Start testpmd on host
>>> 2. Start QEMU
>>> 3. Start testpmd on guest
>>>
>>> Then you will see the drop.
>>> Probably, if testpmd on guest is restarted, then you don't see the drop
>>> again.
>>>
>>> 4. Type 'quit' on guest.
>>> 5. Start testpmd on guest again.
> Hi Michael,
>
> I am sorry that above was caused by my miss configuration.
> So please ignore it.
> If you can have time today, could you please check v7 and v8 performance?

Hi, Tetsuya

I have tried the qemu case but seems it does not have any difference,
maybe my configuration is wrong.

What I used to test is container case from Jianfeng.  And I make a
mistake that V6 compiled by GCC 5.3, but V9 with GCC 4.8, after using
the same compiler, the performance almost the same.

Thanks,
Michael


> Thanks,
> Tetsuya
>
>> OK, I will help to tested today.
>>
>> Thanks,
>> Michael
>