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Xref: sserve comp.sys.intel:5992 comp.os.386bsd.misc:493 comp.periphs.scsi:11929 Path: sserve!newshost.anu.edu.au!munnari.oz.au!spool.mu.edu!howland.reston.ans.net!wupost!cs.utexas.edu!swrinde!menudo.uh.edu!rosie.uh.edu!st1my From: st1my@rosie.uh.edu Newsgroups: comp.sys.intel,comp.os.386bsd.misc,comp.periphs.scsi Subject: Re: Adaptec AIC6260 SCSI-chip, Intel PC and 386BSD Date: 23 Jun 1993 02:03 CDT Organization: University of Houston Lines: 46 Distribution: world Message-ID: <23JUN199302033407@rosie.uh.edu> References: <JARLE.93Jun21180333@storlind.idt.unit.no> <206lflINN918@bonnie.tcd-dresden.de> <1993Jun22.134648.6384@spcvxb.spc.edu> NNTP-Posting-Host: rosie.uh.edu News-Software: VAX/VMS VNEWS 1.41 In article <1993Jun22.134648.6384@spcvxb.spc.edu>, mauritz_c@spcvxb.spc.edu writes... >In article <206lflINN918@bonnie.tcd-dresden.de>, j@bonnie.tcd-dresden.de (J Wunsch) writes: >> In article <JARLE.93Jun21180333@storlind.idt.unit.no> jarle@idt.unit.no writes: >>> >>>Hello, >>> >>>I'm considering purchasing an Intel PC box (Professional workstation/GX). >>>The technical product summary says that there is an AIC6260 SCSI-controller >>>(from Adaptec) integrated on the motherboard, and that the BIOS' low level >>>drivers are Adaptec-152x compatible... >>> >>>I am planning to run 386BSD/NetBSD on this box and would therefore like to >>>know: >>> a) Has anyone used this box with 386BSD and SCSI-devices? >>> If so, did you use the Adaptec-drivers in the kernel >>> (154x/174x-compatible) or did you write your own drivers? >> >> All i can tell you: >> We've got another box with an AIC6260. It's running under DOS for >> some other reason, and runs fine there. (The SCSI disk is the only >> disk.) But any attempt to boot a BSD (with either the old `as' driver, >> or Julian's driver) didn't recognize the SCSI adaptor - so you'll >> need to get some more h/w info (from Adaptec?), and should eventually >> consult julian@dialix.oz.au before starting off. > >I've also heard from other people that this chip is rather slow in >terms of transfer speed. I was told that the maximum the guy could >get out of it was ~500k/sec. I have never used the chip myself, >but that could lead to an annoying bottleneck for a multitasking/user >system. > >Cheers, > >Chris > I got a host-adaptor that uses the AIC-6250EL with an LPS240S and get real, sustained transfers of upto 2.4 MB/s. (no filesystem) With filesystem (Amiga FFS) I get upto 2.2 MB/s sometimes (rarely). The above performance was measured with DiskSpeed and SCSISpeed. Real World Performance: Copying a digitized sound file from disk into ram. Size= 3 841 748 bytes, time= slightly less than 2 seconds. Therefore, either the AIC-6260 is very different from the AIC-6250 or it doesn't use an effective DMA controller (here Signetics 68430) which wouldn't be the fault of the 6260. Anybody from Adaptec out there willing to comment?