Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!mailrus!uwmcsd1!marque!gryphon!jdow From: jdow@gryphon.CTS.COM (J. Dow) Newsgroups: comp.sys.amiga Subject: Re: seeking problem solved w/ adaptec, have DiskPerf results. Message-ID: <5101@gryphon.CTS.COM> Date: 2 Aug 88 02:49:56 GMT References: <8807281433.AA02114@cory.Berkeley.EDU> Reply-To: jdow@gryphon.CTS.COM (J. Dow) Organization: Trailing Edge Technology, Redondo Beach, CA Lines: 57 In article <8807281433.AA02114@cory.Berkeley.EDU> dillon@CORY.BERKELEY.EDU (Matt Dillon) writes: > > I solved the problems I had with my Adaptec 4000A (st506/412->SCSI). >(I accidently had specified a 3ms non-buffered seek instead of a 17uS >buffered seek). > > I am now running a hard disk system using that and a StarDrive SCSI >controller slapped on the side of my StarBoard on the side of my A1000. >Results are as follows: > >System: Duel ST4096 (80MB*2 = 160MB) w/Adaptec 4000A all in an enclosure, > microbotics Starboard II & StarDrive. Completely Custom Setup. > >Max Throughput (massive read on trackdisk.device): 200K/sec > (this is what I expect with the fast filesystem) > More likely you'll see figures running from 163k/sec to 187k/sec with the fast filesystem. (How'd you like the read speeds for small reads - ie old_fs reads? That was my major contribution to the code... There is a 2k read ahead buffer in there. It made a huge difference is speed. And it turns out the choice of 2k was fairly straight forward as well. It sounds like you went to a lot of unnecessary trouble to build yourself an adaptec formatter utility. There IS one available from MicroBotics that I developed (well, threw together) and Mike fine tuned. It handles 4000A's (I have one) and 4707's (I'm running one on an ST238. I like the extra storage. Not much speed difference, though.) There is a new driver available that handles the Adaptec 5500 as well. (That booger assumes you support SCSI disconnect unles syou tell it otherwise. Well, not SD tells it otherwise all the time as the non-interrupt driven SD controller cannot feasibly support reconnect. ) The real speedup will be from the HardFrame controller that I am testing here. I get at least 330k/sec ffs speeds. I suspect it should be higher but the controllers aren't cooperating right with 1:1 interleave. That's testing with an ST277N on the HF. Alas it won't work on the A1000 or A500 without a new ZORRO adaptec. (And an aside t0 all youse guys with 4.0 rev motherboards - get new GARY and U808 chips for starters. Until i did that DMA on my board was hopeless.) (Oh - on the 4070 I also have my "chuckles" drive - an old ST604. Well - it IS another 8.3 megs. And it works just peachy if a tad slower due to the slow seek. - and re the 3ms seeks - I made that booboo first cut as well. Stupid board numbers faster seeks with higher numbers rather than lower which is more intuitive. Dumb!) {@_@} -- Sometimes a bird in the hand leaves a sticky deposit. Perhaps it were best it remain there in the bush with the other one. {@_@} jdow@bix (where else?) Sometimes the dragon wins. Sometimes jdow@gryphon.CTS.COM the knight. Does the fair maiden ever {backbone}!gryphon!jdow win? Surely both the knight and dragon stink both stink to high heaven.