netdev - Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter

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Message-Id: <20081113.141513.116537651.davem@davemloft.net>
Date:	Thu, 13 Nov 2008 14:15:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jdb@...x.dk
Cc:	netdev@...r.kernel.org
Subject: Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter

From: Jesper Dangaard Brouer <jdb@...x.dk>
Date: Thu, 13 Nov 2008 11:29:31 +0100

> Although I'm not happy about the new perf numbers, as I now on a SMP
> system only can route approx 290 kpps, remember I could route 319 kpps
> using a single CPU nosmp kernel.

That unfortunately (can be) the cost of SMP :-/

With multi-flow tests, Robert Olsson is getting 4.2 mpps rates with
NIU and pktgen.  That's what this card is designed for, good
multi-flow workload performance, rather than striving for maximum
single-flow performance.

> (even more anyoing is that oprofile is broken)

Yes, people on lkml are trying to figure out what is causing
that regression on x86.
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