Date: Sun, 24 Dec 1995 13:17:41 -0800 (PST) From: John Dyson <dyson> To: mrcpu@cdsnet.net (Jaye Mathisen) Cc: hackers@freebsd.org Subject: Re: Performance Penalty of Bounce buffers. Message-ID: <199512242117.NAA23610@freefall.freebsd.org> In-Reply-To: <Pine.BSF.3.91.951224123051.6089B-100000@schizo.cdsnet.net> from "Jaye Mathisen" at Dec 24, 95 12:31:46 pm
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> > > > If you are not using a card that requires bounce buffers, ie, I'm using a > 2940, then does leaving BOUNCE_BUFFERS defined cause any performance loss? > > Should not make any significant difference (the buffers are not even checked.) In the case of an ISA adapter and bouncing is not needed, the cost is only to check the physical address of each page in the buffer. Buffers are bounced only on a page by page basis also. John
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