aic7895, IBM 9ZX, Quantum Viking, slow transfer rates

[Albert Max Lai]

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,
> 
> BTJ
> 
> >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 like
> >what I was expecting, but slowing down the Viking slightly (which I gather
> >means that I should disable tagged queueing on that device). I would like
> >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). 
> >
> >Here's what I got after enabling tagged queueing:
> >IBM 9ZX
> >             -------Sequential Output-------- ---Sequential Input----Random--
> >             -Per Char- --Block--- -Rewrite-- -Per Char- --Block-----Seeks---
> >Machine   MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec
> %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----Random--
> >             -Per Char- --Block--- -Rewrite-- -Per Char----Block-----Seeks---
> >Machine   MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec
> %CPU
> >         512  4117 63.7  7044 11.8  2877  9.5  5938 82.8  7459 10.9  81.4 2.8
> >
> >
> >> 
> >> 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:
> >> >      
> >> > {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}
> >> 
> >> Hallo Albert,
> >> 
> >> 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 any
> >> optimisation.
> >> 
> >> 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".
> >> 
> >> 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.
> >> 
> >> regards,
> >> 
> >> K.-H.
> >> 
> >> 
> >> 
> >> 
> >> 
> >> ----------------------------------------------------------
> >> E-Mail: Karl-Heinz Herrmann <k.-h.herrmann at fz-juelich.de>
> >> Date: 17-Mar-99      Time: 15:20:59
> >> ----------------------------------------------------------
> >> 
> >> 
> >> To Unsubscribe: send mail to majordomo at FreeBSD.org
> >> with "unsubscribe aic7xxx" in the body of the message
> >> 
> >
> >--
> >Albert Lai <amlai at 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 at FreeBSD.org
> >with "unsubscribe aic7xxx" in the body of the message
> >
> >
> _______________________________________________________________________
> Bjørn T Johansen (BSc,MNIF,MCP)	Dept. of Customized Solutions
> Senior Systems Engineer		Software Innovation asa
> bjorntj at softinn.no			Drammensveien 175
> Phone	: +47 22 51 85 09		P.O.Box 390 Skøyen
> Fax	: +47 22 73 07 14		N-0212 Oslo, Norway
> Cellular: +47 926 93 298		http://www.softinn.no
> ________________________________________________________________________
> "The stickers on the side of the box said "Supported Platforms: Windows 95,
> Windows NT 4.0, or better", so clearly Linux was a supported platform."
> 
> 
> To Unsubscribe: send mail to majordomo at FreeBSD.org
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> 

--
Albert Lai <amlai at 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



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