Linux Virtualization - Jun 2016 - [PATCH net-next V2] tun: introduce tx skb ring

On 16-06-15 07:52 AM, Jamal Hadi Salim wrote:
> On 16-06-15 04:38 AM, Jason Wang wrote:
>> We used to queue tx packets in sk_receive_queue, this is less
>> efficient since it requires spinlocks to synchronize between producer
> 
> So this is more exercising the skb array improvements. For tun
> it would be useful to see general performance numbers on user/kernel
> crossing (i.e tun read/write).
> If you have the cycles can you run such tests?
> 
Ignore my message - you are running pktgen from a VM towards the host.
So the numbers you posted are what i was interested in.
Thanks for the good work.

cheers,
jamal

On 2016?06?15? 19:55, Jamal Hadi Salim wrote:
> On 16-06-15 07:52 AM, Jamal Hadi Salim wrote:
>> On 16-06-15 04:38 AM, Jason Wang wrote:
>>> We used to queue tx packets in sk_receive_queue, this is less
>>> efficient since it requires spinlocks to synchronize between
producer
>> So this is more exercising the skb array improvements. For tun
>> it would be useful to see general performance numbers on user/kernel
>> crossing (i.e tun read/write).
>> If you have the cycles can you run such tests?
>>
> Ignore my message - you are running pktgen from a VM towards the host.
Actually reversed, test were done from an external host to VM.

Thanks
> So the numbers you posted are what i was interested in.
> Thanks for the good work.
>
> cheers,
> jamal
>