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Re: [Qemu-devel] [PATCH] net: Remove vhostforce option in addition to vh
From: |
Jason Wang |
Subject: |
Re: [Qemu-devel] [PATCH] net: Remove vhostforce option in addition to vhost parameter |
Date: |
Thu, 28 May 2015 11:36:38 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 05/28/2015 11:21 AM, Jason Wang wrote:
>
> On 05/27/2015 07:57 PM, Michael S. Tsirkin wrote:
>> On Wed, May 27, 2015 at 04:45:34PM +0800, Jason Wang wrote:
>>>>
>>>> On 05/27/2015 02:26 PM, Pankaj Gupta wrote:
>>>>>> Ping.
>>>>>>
>>>>>> Can I get any suggestions on this patch.
>>>>>>
>>>>>> Best regards,
>>>>>> Pankaj
>>>>>>
>>>>>>>> vhostforce was added to enable vhost when
>>>>>>>> guest don't have MSI-X support.
>>>>>>>> Now, we have scenarios like DPDK in Guest which dont use
>>>>>>>> interrupts and still use vhost. Also, performance of guests
>>>>>>>> without MSI-X support is getting less popular.
>>>>>>>>
>>>>>>>> Its OK to remove this extra option and enable vhost
>>>>>>>> on the basis of vhost=ON/OFF.
>>>>>>>> Done basic testing with vhost on/off for latest guests
>>>>>>>> and old guests(non-msix).
>>>>>>>>
>>>>>>>> Signed-off-by: Pankaj Gupta <address@hidden>
>>>> Looks good. Two questions:
>>>>
>>>> - Did libvirt use this? if not, we may want to drop vhostfore option
>>>> completely.
>> Yes, it did.
>>
> For vhost-user, vhostforce is mandatory. But how about tap? Looks like
> it was not used, and I could not even find any option in
> http://libvirt.org/formatdomain.html.
>
CC Michal for the answer.
Re: [Qemu-devel] [PATCH] net: Remove vhostforce option in addition to vhost parameter, Michael S. Tsirkin, 2015/05/27