On 2018年09月07日 01:51, Michael S. Tsirkin wrote:
On Thu, Sep 06, 2018 at 12:05:24PM +0800, Jason Wang wrote:
This patch implement TUN_MSG_PTR msg_control type. This type allows
the caller to pass an array of XDP buffs to tuntap through ptr field
of the tun_msg_control. If an XDP program is attached, tuntap can run
XDP program directly. If not, tuntap will build skb and do a fast
receiving since part of the work has been done by vhost_net.
This will avoid lots of indirect calls thus improves the icache
utilization and allows to do XDP batched flushing when doing XDP
redirection.
Signed-off-by: Jason Wang<jasowang@xxxxxxxxxx>
Is most of the benefit in batched flushing or skipping
indirect calls? Because if it's flushing we can gain
most of it easily by adding an analog of xmit_more.
Should be both. XDP_DROP doesn't flush but it gives obvious improvement.
Thanks
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