Date: Sun, 05 Apr 2009 15:34:26 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-net@freebsd.org Subject: Re: Advice on a multithreaded netisr patch? Message-ID: <grac1s$p56$1@ger.gmane.org> In-Reply-To: <alpine.BSF.2.00.0904051422280.12639@fledge.watson.org> References: <gra7mq$ei8$1@ger.gmane.org> <alpine.BSF.2.00.0904051422280.12639@fledge.watson.org>
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[-- Attachment #1 --] Robert Watson wrote: > > 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. Makes sense, but on the other hand - I see people are routing at least 250,000 packets per seconds per direction with these cards, so they probably aren't the bottleneck (pro/1000 pt on pci-e). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAknYs2sACgkQldnAQVacBcgOzACguAsTzdt9DZStuslyOHAti/9J 9noAoPDt1v9OHmV2gx/eYD7cRClVnDMJ =UEzZ -----END PGP SIGNATURE-----
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