netdev - Re: [RFC PATCH net-next 2/8] sfc: batch up RX delivery on EF10

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Date:	Tue, 19 Apr 2016 07:47:37 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Edward Cree <ecree@...arflare.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	linux-net-drivers@...arflare.com
Subject: Re: [RFC PATCH net-next 2/8] sfc: batch up RX delivery on EF10

On Tue, 2016-04-19 at 14:35 +0100, Edward Cree wrote:
> Improves packet rate of 1-byte UDP receives by 10%.

Sure, by adding yet another queue and extra latencies.

If the switch delivered a high prio packet to your host right before a
train of 60 low prio packets, this is not to allow us to wait the end of
the train.

We have to really invent something better, like a real pipeline, instead
of hacks like this, adding complexity everywhere.

Have you tested this on cpus with tiny caches, like 32KB ?