Re: [PATCH net-next 03/21] ethtool, stats: introduce standard XDP statistics

On Wed, 2021-08-04 at 18:43 -0600, David Ahern wrote:

On 8/4/21 12:27 PM, Saeed Mahameed wrote:

quoted

quoted

I just ran some quick tests with my setup and measured about 1.2%
worst

1.2% is a lot ! what was the test ? what is the change ?

I did say "quick test ... not exhaustive" and it was definitely
eyeballing a pps change over a small time window.

If multiple counters are bumped 20-25 million times a second (e.g.
XDP
drop case), how measurable is it? I was just trying to ballpark the
overhead - 1%, 5%, more? If it is <~ 1% then there is no performance
argument in which case let's do the right thing for users - export
via
existing APIs.

from experience I don't believe it can be more than 1% and yes on
existing APIs !