[Coco] hard disk performance

[Robert Gault]

Tim Fadden wrote:
> ???  I am confused.
> 
> According to your test,  it took 25 seconds to read 1,024,000 bytes  or, 
> one megabyte.  If you devide 1024000 by 25 the result is 40960 closer to 
> 40kbytes/sec or  327Kbits.  Pleas show me your math to get 12k/sec  12k 
> what?  bits bytes blocks.
> I am sure I am missing something here.  Just not sure what.
> 
> Your test is exactly what I did and got 30secs for a megaread pass.  to 
> me that seems to be 34kbytes/sec.
> It must be that I am confused just how much data megaread is reading!  
> is it reading megabytes, or megabits?
> 
> Whatever it is reading, its a bunch faster than floppys! ha ha ha
> 
> Confused in AZ. Tim
> 
> 
> 
> Robert Gault wrote:
>> Discussing test results is pointless unless the test is specified 
>> precisely and all reported test adhere to the same protocol.
>>
>> So, to propose a specific test, get Megaread from the NitrOS-9 
>> distribution and transfer it to your Coco hard drive system. Then 
>> execute the command sequence
>> load date
>> date t; megaread </h#@; date t
>> where # is the number of the drive under test.
>>
>> Results on my Ken-Ton scsi adapter, 6309 modified RGB-DOS driver, and 
>> Segate ST-296N hard drive are
>> Fri Sep. 26, 2008 07:12:32 PM
>> Fri Sep. 26, 2008 07:13:57 PM
>> for one pass of megaread. That should be ~12k/sec.
>>
>> The same test using an Adaptec 4000A board with a Tandon TM-252 gave
>> 11.4k/sec.
>>
>> My modified driver uses the TFM command to transfer data.
>>
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
>> http://five.pairlist.net/mailman/listinfo/coco
>>
> 
> 
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> Coco at maltedmedia.com
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> 

The time interval is 13:57-12:32 which is not 25 seconds; which would be 
just great. 12:60-12:32=28 sec. 13:57-13:00=57sec 28+57=85 sec.
1024K/85sec = 12.05 K/sec

If the above is wrong, then my system is much better than I thought. Any 
comments?