Re: [PATCH net-next 09/11] tuntap: accept an array of XDP buffs through sendmsg()
From: Jason Wang <hidden>
Date: 2018-09-07 07:33:08
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:quoted
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<redacted>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 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization