Date: Wed, 17 Mar 1999 10:26:24 -0500 (EST) From: Albert Max Lai <amlai@columbia.edu> To: Bjorn T Johansen <bjorntj@softinn.no> Cc: aic7xxx@FreeBSD.ORG Subject: Re: aic7895, IBM 9ZX, Quantum Viking, slow transfer rates Message-ID: <Pine.GSO.3.95qL.990317102553.3744B-100000@bonjour.cc.columbia.edu> In-Reply-To: <3.0.1.32.19990317162008.009bbe00@pop.eunet.no>
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On Wed, 17 Mar 1999, Bjorn T Johansen wrote: > I was just wondering what is the most optimal depth on tagged queueing? > And where can I find the benchmark program you use? I found my copy on this web page: <http://www.raid-storage.com/benchmarks.html>; > Regards, >=20 > BTJ >=20 > >On Wed, 17 Mar 1999, Karl-Heinz Herrmann wrote: > > > >I just recompiled my kernel to automatically enable tagged queueing with= a > >depth of 8. This seems to improve speeds on the 9ZX to something more li= ke > >what I was expecting, but slowing down the Viking slightly (which I gath= er > >means that I should disable tagged queueing on that device). I would lik= e > >to thank everyone for all of their help. (Although I'd still be very > >interested if anyone had a 9ZX that they could try the same benchmark on= , > >just for comparison purposes).=20 > > > >Here's what I got after enabling tagged queueing: > >IBM 9ZX > > -------Sequential Output-------- ---Sequential Input----Ran= dom-- > > -Per Char- --Block--- -Rewrite-- -Per Char- --Block-----See= ks--- > >Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /se= c > %CPU > > 512 4944 76.4 9916 16.2 4007 13.3 6170 85.9 9644 13.5 99.= 9 3.3 > > > >Quantum Viking > > -------Sequential Output-------- ---Sequential Input----Ran= dom-- > > -Per Char- --Block--- -Rewrite-- -Per Char----Block-----See= ks--- > >Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /se= c > %CPU > > 512 4117 63.7 7044 11.8 2877 9.5 5938 82.8 7459 10.9 81.= 4 2.8 > > > > > >>=20 > >> On 17-Mar-99 Albert Max Lai wrote: > >> > Tag Queue Enable Flags: 0x0000 > >> > Ordered Queue Tag Flags: 0x0000 > >> > Default Tag Queue Depth: 8 > >> > Tagged Queue By Device array for aic7xxx host instance 0: > >> > =20 > >> > {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255} > >> > Actual queue depth per device for aic7xxx host instance 0: > >> > {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1} > >>=20 > >> Hallo Albert, > >>=20 > >> you have tagged queuing disabled (Actual depth 1 on all targets) and > >> Tag Queue Enable Flags: 0x0000. > >> So your drive is working in dumb mode one command at a time without an= y > >> optimisation. > >>=20 > >> put some bootflag (see somewhere in the aicxxx doc) in lilo.conf. > >> Sorry I'm not at my Linux-Box right now so I can't look it up. > >> It's something like tag_queue{{0,0,0,0,,,,}} where 0 means "use > >> default". > >>=20 > >> If you enable it (-> Tag Queue Enable Flags: 0x[nonzero]) and the > >> actual depth is still 1 you can have a look with scsiinfo if the drive > >> has tagged queuing switched on. > >>=20 > >> regards, > >>=20 > >> K.-H. > >>=20 > >>=20 > >>=20 > >>=20 > >>=20 > >> ---------------------------------------------------------- > >> E-Mail: Karl-Heinz Herrmann <k.-h.herrmann@fz-juelich.de> > >> Date: 17-Mar-99 Time: 15:20:59 > >> ---------------------------------------------------------- > >>=20 > >>=20 > >> To Unsubscribe: send mail to majordomo@FreeBSD.org > >> with "unsubscribe aic7xxx" in the body of the message > >>=20 > > > >-- > >Albert Lai <amlai@columbia.edu> 1018D East Campus > >Residential Computer Consultant 411 W. 116th St. > >Columbia University New York, NY 10027 > >http://www.columbia.edu/~aml61 (212)853-4854 > > > > > > > > > > > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe aic7xxx" in the body of the message > > > > > _______________________________________________________________________ > Bj=F8rn T Johansen (BSc,MNIF,MCP)=09Dept. of Customized Solutions > Senior Systems Engineer=09=09Software Innovation asa > bjorntj@softinn.no=09=09=09Drammensveien 175 > Phone=09: +47 22 51 85 09=09=09P.O.Box 390 Sk=F8yen > Fax=09: +47 22 73 07 14=09=09N-0212 Oslo, Norway > Cellular: +47 926 93 298=09=09http://www.softinn.no > ________________________________________________________________________ > "The stickers on the side of the box said "Supported Platforms: Windows 9= 5, > Windows NT 4.0, or better", so clearly Linux was a supported platform." >=20 >=20 > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe aic7xxx" in the body of the message >=20 -- Albert Lai <amlai@columbia.edu> 1018D East Campus Residential Computer Consultant 411 W. 116th St. Columbia University New York, NY 10027 http://www.columbia.edu/~aml61 (212)853-4854 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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