netdev - Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

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Message-ID: <4cd3c66e-b0f1-440c-a170-a1df7d6a2691@tahiti.vyatta.com>
Date:	Sun, 02 Oct 2011 07:47:12 -0700 (PDT)
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Willy Tarreau <w@....eu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, starlight@...nacle.cx
Subject: Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

Try disabling PCI DMA remapping. The additional overhead of setting
up IO mapping can be a performance buzz kill. Try CONGIG_DMAR=n

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