Date: Tue, 30 Jan 1996 19:07:33 +1000 (AEST) From: Greg Ungerer <gerg@stallion.oz.au> To: Bruce Evans <bde@zeta.org.au> Cc: bde@zeta.org.au, gerg@stallion.oz.au, hackers@freebsd.org Subject: Re: Multi-Port Async Cards Message-ID: <9601301907.aa25683@cluster.stallion.oz.au> In-Reply-To: <199601300854.TAA32122@godzilla.zeta.org.au> from "Bruce Evans" at Jan 30, 96 07:54:27 pm
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Bruce Evans writes: > >> [Cyclades, 486DX/33], -opost 0.3%/KB > >> > >> 16550, 486DX2/66, -opost 0.25% (one port) > >>... > >> Linux Comtrol Rocketport driver as reported in Linux Journal: > >> > >> 486DX/33, -opost 0.08% > >> 486DX/33, opost 0.77% > > >Again, different OS and different number of ports. It does make a > >difference... The only fair comparison is all boards similarly configured, > >in the same system, running the same OS... > > It's important to compare with other OS's to make sure that FreeBSD > is the best. My numbers indicate that the OS doesn't actually make much > difference unless the driver or OS does something wrong. The 0.08% > for the Comtrol can be predicted from the 0.25% for the 16550 by > dividing by a bit less than 2 for the improvement from 8-bit i/o's > to 16-bit i/o's and then reducing a bit more for the lower interrupt > overhead. Sure. I looked up further results to compare. These where done on a Compaq Prolient with Pentium/60 (just to compare :-), and again with a commercial UNIX variant... EasyConnection 8/64 (ISA) 16 ports 0.07 %/kb EasyConnection 8/64 (ISA) 32 ports 0.09 %/kb EasyConnection 8/64 (EISA) 8 ports 0.03 %/kb EasyConnection 8/64 (EISA) 16 ports 0.04 %/kb EasyConnection 8/64 (EISA) 32 ports 0.06 %/kb EasyConnection 8/64 (EISA) 64 ports 0.09 %/kb But I suppose it don't mean much yet, since we cannot compare with FreeBSD numbers... Seeya Gerg --------------------------------------------------------------------------- Greg Ungerer EMAIL: gerg@stallion.com Stallion Technologies Pty Ltd PHONE: +61 7 3270 4271 33 Woodstock Rd, Toowong, QLD 4066, Australia FAX: +61 7 3270 4245
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