Re: [PATCH net-next V4 0/6] switch to use tx skb array in tun

On 2016年06月30日 23:45, Michael S. Tsirkin wrote:

On Thu, Jun 30, 2016 at 02:45:30PM +0800, Jason Wang wrote:

quoted

quoted

Hi all:

This series tries to switch to use skb array in tun. This is used to
eliminate the spinlock contention between producer and consumer. The
conversion was straightforward: just introdce a tx skb array and use
it instead of sk_receive_queue.

A minor issue is to keep the tx_queue_len behaviour, since tun used to
use it for the length of sk_receive_queue. This is done through:

- add the ability to resize multiple rings at once to avoid handling
  partial resize failure for mutiple rings.
- add the support for zero length ring.
- introduce a notifier which was triggered when tx_queue_len was
  changed for a netdev.
- resize all queues during the tx_queue_len changing.

Tests shows about 15% improvement on guest rx pps:

Before: ~1300000pps
After : ~1500000pps

Acked-by: Michael S. Tsirkin<mst@redhat.com>

Acked-from-altitude: 34697 feet.

Wow, thanks a lot!
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