Date: Wed, 17 Mar 1999 16:20:08 +0100 From: Bjorn T Johansen <bjorntj@softinn.no> To: aic7xxx@FreeBSD.ORG Subject: Re: aic7895, IBM 9ZX, Quantum Viking, slow transfer rates Message-ID: <3.0.1.32.19990317162008.009bbe00@pop.eunet.no> In-Reply-To: <Pine.GSO.3.95qL.990317093620.3744A-100000@bonjour.cc.colum bia.edu> References: <XFMail.990317153040.k.-h.herrmann@fz-juelich.de>
next in thread | previous in thread | raw e-mail | index | archive | help
I was just wondering what is the most optimal depth on tagged queueing?
And where can I find the benchmark program you use?
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).=20
>
>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
>
>
>>=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 any
>> 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) Dept. of Customized Solutions
Senior Systems Engineer Software Innovation asa
bjorntj@softinn.no Drammensveien 175
Phone : +47 22 51 85 09 P.O.Box 390 Sk=F8yen
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@FreeBSD.org
with "unsubscribe aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3.0.1.32.19990317162008.009bbe00>