netdev - Re: SO_REUSEPORT - can it be done in kernel?

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Date:	Mon, 28 Feb 2011 18:07:49 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Graf <tgraf@...radead.org>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>, rick.jones2@...com,
	therbert@...gle.com, wsommerfeld@...gle.com,
	daniel.baluta@...il.com, netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

Le lundi 28 février 2011 à 11:37 -0500, Thomas Graf a écrit :

> How do you measure the qps? The output of queryperf? That is not always
> accurate. I run rdnc stats twice and then calculate the qps based on the
> counter "queries resulted in successful answer" diff and timestamp diff.
> 

I have some custom ethernet/system monitoring package installed, so I
get packet rates from it.

I appears my two source machines were not fast enough. (One had LOCKDEP
kernel).

I now reach 320 kqps, even if I force NIC interrupts through one cpu
only.

> The numbers differ a lot depending on the architecture we test on.
> 
> F.e. on a 12 core AMD with 2 NUMA nodes:
> 
> 2.6.32   named -n 1: 37.0kqps
>          named:       3.8kqps (yes, no joke, the socket receive buffer is
>                                always full and the kernel drops pkts)

Yes, this old kernel miss commit c377411f2494a93 added in 2.6.35
(net: sk_add_backlog() take rmem_alloc into account)

Quoting the change log :

 Under huge stress from a multiqueue/RPS enabled NIC, a single flow udp
 receiver can now process ~200.000 pps (instead of ~100 pps before the
 patch) on a 8 core machine.

> 
> 2.6.38-rc5+ with Herbert's patches:
>         named -n 1:  36.9kqps
>         named:      222.0kqps


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