On Thu, 30 Apr 2020 14:20:20 +0000
Haiyang Zhang [off-list ref] wrote:

quoted

-----Original Message-----
From: Jesper Dangaard Brouer <redacted>

The hyperv NIC drivers XDP implementation is rather disappointing as it will
be a slowdown to enable XDP on this driver, given it will allocate a new page
for each packet and copy over the payload, before invoking the XDP BPF-
prog.  

This needs correction. As I said previously -- 
This statement is not accurate -- The data path of netvsc driver does memory 
allocation and copy even without XDP, so it's not "a slowdown to enable XDP".

Okay, I have changed the paragraph text to:

 The hyperv NIC driver does memory allocation and copy even without XDP.
 In XDP mode it will allocate a new page for each packet and copy over
 the payload, before invoking the XDP BPF-prog.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer