netdev - Re: Multiqueue pktgen and ingress path (Was: [PATCH v5 2/2] pktgen: introduce xmit_mode '<start_xmit|netif

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Message-ID: <1431100569.22756.12.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 08 May 2015 08:56:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <ast@...mgrid.com>, netdev@...r.kernel.org
Subject: Re: Multiqueue pktgen and ingress path (Was: [PATCH v5 2/2] pktgen:
 introduce xmit_mode '<start_xmit|netif_receive>')

On Fri, 2015-05-08 at 17:49 +0200, Jesper Dangaard Brouer wrote:

> I'm quite puzzled why a single atomic op could "freeze" my system from
> scaling beyond 24Mpps.

Law of physics, since this cache line has to constantly fly among your
cpus.



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