Subject: Re: 3000/300 : SCSI speed & RAM questions
To: None <port-alpha@netbsd.org>
From: Toru Nishimura <nisimura@itc.aist-nara.ac.jp>
List: port-alpha
Date: 02/02/2000 10:48:17
> I've recently installed 1.4.1 on a Decstation 3000/300, and I need to
> agree that the installation is real pleasure trip, now: congratulation
> to the team!!
>
> 1) SCSI: I've put on the machine a Seagate Barracuda HD, that on a pci
> adapter reach the peak of 7Mb/sec when doing "dd ... etc etc", but on
> this alpha reach just 1.3Mb/sec. Is this the level of performance I
> should expect or there is something to tune ?

With my DEC3000/300 iozone reports following rough numbers;

        2412252 bytes/second for writing the file
        3667151 bytes/second for reading the file

I think these figure are reasonable for old RZ28 (== Seagate 2G);

probe(asc0:5:0): max sync rate 5.00Mb/s
sd2 at scsibus0 targ 5 lun 0: <DEC, RZ28     (C) DEC, 442D> SCSI2 0/direct fixed
sd2: 2007 MB, 3045 cyl, 16 head, 84 sec, 512 bytes/sect x 4110480 sectors

DEC3000/300 has 25MHz clocked NCR53C94 and the performance is far ragged
behind its successors 53C710/810 commonly found in PCI generations.

Tohru Nishimura
Nara Institute of Science and Technology