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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1461077257.10638.185.camel@edumazet-glaptop3.roam.corp.google.com>
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 ?