🚀 go-pugleaf

In article <3n94dh$4bo@tricbbs.tricbbs.fn.sub.org>,
Cees de Groot <cg@tricbbs.tricbbs.fn.sub.org> wrote:
>In article <1995Apr18.211228.1484@kfdata.no>,
>Hans Petter Fasteng <hansf@kfdata.no> wrote:
>>: Does anyone have either an ASUS SP3G and use the built-in SCSI, or have
>>: another board with an NCR 53c810 SCSI controller card installed?
>>
>>
>>Maybe the preformance the driver deliver is not to good?  I am not shure
>>since I have not tested the system on anny other thing than linux.
>>
>From the Byte Unix Benchmarks on an ASUS SP3G 486/66 with NCR on a Quantum
>Empire 1080:
>
>File Read  (10 seconds)                   96526.0 KBps  (10 secs, 6 samples)
>File Write (10 seconds)                    1897.0 KBps  (10 secs, 6 samples)
>File Copy  (10 seconds)                    1144.0 KBps  (10 secs, 6 samples)
>File Read  (30 seconds)                   99010.0 KBps  (30 secs, 6 samples)
>File Write (30 seconds)                    1710.0 KBps  (30 secs, 6 samples)
>File Copy  (30 seconds)                     957.0 KBps  (30 secs, 6 samples)
>
>I think that is very acceptable performance (and I think the guys at Byte
>didn't reckon with a 10Mb buffer cache back when they wrote the benchmarks :-))
>
>BTW, the almost 100MB/s is _very_ close to the 133MB theoretical limit on a
>PCI board, and that says a lot about the speed of Linux in general and
>ext2fs in particular...
>
>............... the driver is rock solid.
>-- 
>Cees de Groot, OpenLink Ltd.    <cg@tricbbs.fn.sub.org>    CI$ 100525,1102
>PGP23a:  73 5D BA 7C F8 EF DD 65  56 68 AF BB 2B 58 2C 8B [Key on servers]
><A HREF=http://www.decus.de/people/de_groot/bio.html>Click</A>
>  -- Programmir est mourir un peu

Oops, What is the number above? I just saw this when I want to post
the NCR SCSI performance questions.

The memory to memory copy on Pentinum-100 (intel motherboard) is 24 MBps.
The memory to register or reverse is 40 MB (32 bits) or 80 MB (64 bits).
The cache to register transfer rate is 110 MB (132 MBps Max. in the spec.).

There is no way to get 100 MBps file Tx rate over SCSI controller. Impossible!

The disks we used are Seagate Baracuda ST12550N (SCSI-2, 10 MB)
They are can get 8.2 MBps reading rate under Sparc stations, SGI and DEC/Alpha
by accessing two disks simutaniously; 1 disk can only read 5.2 MBps.
However, under Pentinum-100 with NCR53c810 SCSI host adapter, we can get
only 3.2 MBps under either single disk or double disks accessing. (same disks)
So, this mean the SCSI controller is the bottleneck.

What I need is the existing or known SCSI controllers that are really SCSI-2.
That is, that any SCSI controller for PC can go over 6 MBps is great.

Please send me email about the brands, with their performance and price.

Thanks for any information,


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