Xref: utzoo comp.sys.amiga.tech:6108 comp.sys.amiga:36546 Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun-barr!decwrl!shlump.dec.com!frambo.dec.com From: balzer@frambo.dec.com (Christian Balzer) Newsgroups: comp.sys.amiga.tech,comp.sys.amiga Subject: Re: ST296N Interleave (was Re: Pal, Jr. HD controller info needed) Summary: Something's definitivly wrong here... Keywords: 2090x is the same league as HardFrame. Message-ID: <3462@shlump.dec.com> Date: 10 Jul 89 17:00:58 GMT Sender: news@shlump.dec.com Followup-To: comp.sys.amiga.tech Organization: DEC SWAS Frankfurt/W.Germany Lines: 58 In article <58224@linus.UUCP>, rachamp@mbunix.mitre.org (Richard A. Champeaux) writes... >In article <759@censor.UUCP> hugh@censor.UUCP (Hugh D. Gamble) writes: >>In article <727@orbit.UUCP>, baxt@pnet51.cts.com (Bill Backstrom) writes: >>... >>> I have a B2000 with a 2090 and a ST296N (85 meg SCSI). I'm running >>> 1.3, definitely using FFS (512 byte blocks) and version 34.4 of >>> hddisk. >>> >>> Diskperf gives me a reads of about 80K bytes/sec and writes of 155K >>> bytes/s for 32K blocks. I've also had an ST125 (20 meg ST-506) on the >>... >>> I have tried different interleaves, another 2090 card, and various >>> partition sizes. Nothing has improved the performance. The only >>... >>> Bill Backstrom > }That's Funny, I have a HardFrame 2000 and a ST296N and diskperf is telling }me that with 32k buffers, I'm getting 655K reads and 291K writes. }The sheet that came with the drive said that it could handle an interleave }of 1 and the manual for the HardFrame said to use an interleave of 1. }Actually it said it was fast enough to keep up with all drives and to }use an interleave of 1 for all drives. } }Anyhow, I'm supprised that the 2090 and the 2090a aren't blazing along with }the 296N. It's a fairly fast drive, but a DMA controller should be able }to keep up with it without any problem. } }Rich Champeaux (rachamp@mbunix.mitre.org) Rich is quite right to be astonished, the 2090x is definitivly able to keep up and deliver speeds up to 1.2 MB/sec. In my HD controller review (a new revision is coming out in about 3 weeks) the 2090 delivered well over 500 KB/sec with a Rodime SCSI drive. With a CDC Wren, several users reported speeds over 1 MB/sec (read). The 2090 handles an interleave of 1 with no problems. Something very subtle with Bill's setup is wrong, too bad these airline tickets are that expensive, I would like to drop by and investigate this phenomen myself. :-) Regards, - N E W S F O D D E R, don'tcha love it? -- _ _ / / | \ \ aka Christian Balzer - The Software Brewery - < < |-< > EMail: ...!decwrl!frambo.dec.com!CB -OR- CB@frambo.dec.com \ \_ |_/ / E-Net: FRAMBO::BALZER | Home-Phone: +49 6150 4151 (CET!) ------------ PMail: Im Wingertsberg 45, D-6108 Weiterstadt, F.R.G.