netdev - Re: [Questions]

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Message-ID: <20140820100520.GA16698@redhat.com>
Date:	Wed, 20 Aug 2014 12:05:20 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Zhangjie (HZ)" <zhangjie14@...wei.com>
Cc:	Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
	davem@...emloft.net, kvm@...r.kernel.org, liuyongan@...wei.com,
	qinchuanyu@...wei.com
Subject: Re: [Questions]

On Wed, Aug 20, 2014 at 05:37:01PM +0800, Zhangjie (HZ) wrote:
> Hi MST,
> 
> I see "reduce networking latency"
> from Networking Todo, the idea is to "allow handling short packets from softirq or VCPU context".
> If from softirq context, how could softirq copy skb to guest memory? If the method is to use mmstruct of Qemu,
> would it be expensive?

I have some very rough patches to explain this part of the idea.
Will dig them out for you.

> If from VCPU context, maybe the internal operation of the virtual machine will have a significant delay.

We'd have to find a good heuristic here.
Maybe for a small number of very short packets the delay won't be significant.

> Thanks!
> -- 
> Best Wishes!
> Zhang Jie
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