Subject: Re: [PATCH net-next 3/3] vhost_net: basic polling support

From: Jason Wang <[email-masked]>
Date: Tue, 1 Dec 2015 13:17:49 +0800

On 11/30/2015 06:44 PM, Michael S. Tsirkin wrote:
> On Wed, Nov 25, 2015 at 03:11:29PM +0800, Jason Wang wrote:
>> > This patch tries to poll for new added tx buffer or socket receive
>> > queue for a while at the end of tx/rx processing. The maximum time
>> > spent on polling were specified through a new kind of vring ioctl.
>> > 
>> > Signed-off-by: Jason Wang <[email-masked]>
> One further enhancement would be to actually poll
> the underlying device. This should be reasonably
> straight-forward with macvtap (especially in the
> passthrough mode).
>
>

Yes, it is. I have some patches to do this by replacing
skb_queue_empty() with sk_busy_loop() but for tap. Tests does not show
any improvement but some regression.  Maybe it's better to test macvtap.