Re: [PATCH v9 net-next 5/7] net: simple poll/select low latencysocket poll

From: Eric Dumazet
Date: Wed Jun 05 2013 - 09:31:05 EST

On Wed, 2013-06-05 at 13:34 +0300, Eliezer Tamir wrote:
> A very naive select/poll busy-poll support.
> Add busy-polling to sock_poll().
> When poll/select have nothing to report, call the low-level
> sock_poll() again until we are out of time or we find something.
> Right now we poll every socket once, this is suboptimal
> but improves latency when the number of sockets polled is not large.
> Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
> Tested-by: Willem de Bruijn <willemb@xxxxxxxxxx>
> Signed-off-by: Eliezer Tamir <eliezer.tamir@xxxxxxxxxxxxxxx>
> ---

I am a bit uneasy with this one, because an applicatio polling() on one
thousand file descriptors using select()/poll(), will call sk_poll_ll()
one thousand times.

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