netdev - Re: [PATCH net-next V2] tun: introduce tx skb ring

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Message-ID: <5762507A.4030801@redhat.com>
Date:	Thu, 16 Jun 2016 15:08:42 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>, mst@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	davem@...emloft.net
Cc:	eric.dumazet@...il.com, brouer@...hat.com
Subject: Re: [PATCH net-next V2] tun: introduce tx skb ring



On 2016年06月15日 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
>