🚀 go-pugleaf

oyang@fcit.monash.edu.au (Kai O'Yang) wrote:

>From what I've got, SCSI is definitely better than EIDE.
>System: p120 with ASUS P55TP4XE m/b, 32M ram, Solaris 2.4 x86,
>EIDE using built in EIDE controller, SCSI using ASUS 200 NCR controller.
>EIDE H/D: Quantum Fireball 1080 (running under mode 4?)
>SCSI H/D: IBM DPES-1080 

>iozone 100 8192 (writing and reading 100M seq using 8k block size) gave me:
>Fireball: 4126627 bytes/s write, 4358171 bytes/s read,
>IBM DPES: 4088015 bytes/s write, 4515831 bytes/s read.

>When I ran these tests, I disabled swap, both partitions were created fresh,
>and the most notable difference between the two was cpu utilisation:
>Fireball: constantly hitting 95-100%,
>IBM DPES: constantly around  30%.

30% for the SCSI device, isn't it a bit high?  Is iozone only
reading/writing sequentially to the file?  On my system, under os/2,
diskio (testing sequential data transfer rate) takes about 8% of the
CPU time.  This is on a ASUS P55TP4XE, 32MB ram, AHA-3940 with a SCSI
quantum fireball 1080.

>If someone can tell me how to minimise the cpu utilisation of the Fireball I'd
>be most grateful.

Use bus master drivers for your EIDE drive...if you can find them and
if they are stable!  I know that they are available for OS/2, NT,
Win95 but I have no idea about solaris.  Under OS/2 I tried them for a
couple of days, then removed them because my system was unstable.  I'm
really glad I moved to SCSI when I upgraded my system (still have this
old maxtor IDE drive though).

>Kai
>--

>Kai O'Yang, PSCIT, Peninsula Campus, Monash Uni, Frankston, VIC 3199, Australia.
>email: oyang@fcit.monash.edu.au	Tel: +61 3 9904 4615, FAX: +61 3 9904 4124
>-------------------------------------------------------------------------------


//
// Harold Roussel            email: roussel@physics.mcgill.ca
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