Date: Sun, 5 Apr 2009 14:24:01 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: Advice on a multithreaded netisr patch? Message-ID: <alpine.BSF.2.00.0904051422280.12639@fledge.watson.org> In-Reply-To: <gra7mq$ei8$1@ger.gmane.org> References: <gra7mq$ei8$1@ger.gmane.org>
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On Sun, 5 Apr 2009, Ivan Voras wrote: > I thought this has something to deal with NIC moderation (em) but can't > really explain it. The bad performance part (not the jump) is also visible > over the loopback interface. FYI, if you want high performance, you really want a card supporting multiple input queues -- igb, cxgb, mxge, etc. if_em-only cards are fundamentally less scalable in an SMP environment because they require input or output to occur only from one CPU at a time. Robert N M Watson Computer Laboratory University of Cambridge
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