On Wed, Dec 02, 2015 at 01:04:03PM +0800, Jason Wang wrote:

On 12/01/2015 10:43 PM, Michael S. Tsirkin wrote:

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On Tue, Dec 01, 2015 at 01:17:49PM +0800, Jason Wang wrote:

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On 11/30/2015 06:44 PM, Michael S. Tsirkin wrote:

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On Wed, Nov 25, 2015 at 03:11:29PM +0800, Jason Wang wrote:

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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 <jasowang@redhat.com>

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.

We probably don't want to do this unconditionally, though.

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Tests does not show
any improvement but some regression.

Did you add code to call sk_mark_napi_id on tap then?
sk_busy_loop won't do anything useful without.

Yes I did. Probably something wrong elsewhere.

Is this for guest-to-guest? the patch to do napi
for tap is still not upstream due to minor performance
regression.  Want me to repost it?

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 Maybe it's better to test macvtap.

Same thing ...