Re: [E1000-devel] [PATCH RFC net-next] net: epoll support for busy poll

[Eric D. <eri...@gm...>]

On Wed, 2013-08-21 at 13:39 +0300, Eliezer Tamir wrote:

> 
> Instead of remembering the napi_id for all the sockets in an epoll,
> we only track the first socket we see with any unique napi_id.
> The rational for this is that while there may be many thousands of
> sockets tracked by a single epoll, we expect to only see a handful
> of unique napi_ids in most cases.

This looks buggy assumption to me.

We use epoll() with in the order of millions of fds per epoller, and
typically one napi_id per cpu.

With your model, we would have to use nr_cpu epollers and make sure that
sockets are properly placed on those epollers by their napi_ids.