🚀 go-pugleaf

In article <58224@linus.UUCP>, rachamp@mbunix.mitre.org (Richard A. Champeaux) writes...
>In article <759@censor.UUCP> hugh@censor.UUCP (Hugh D. Gamble) writes:
>>In article <727@orbit.UUCP>, baxt@pnet51.cts.com (Bill Backstrom) writes:
>>... 
>>> I have a B2000 with a 2090 and a ST296N (85 meg SCSI). I'm running
>>> 1.3, definitely using FFS (512 byte blocks) and version 34.4 of
>>> hddisk.  
>>> 
>>> Diskperf gives me a reads of about 80K bytes/sec and writes of 155K
>>> bytes/s for 32K blocks. I've also had an ST125 (20 meg ST-506) on the
>>... 
>>> I have tried different interleaves, another 2090 card, and various
>>> partition sizes. Nothing has improved the performance. The only
>>... 
>>> Bill Backstrom
> 
}That's Funny, I have a HardFrame 2000 and a ST296N and diskperf is telling
}me that with 32k buffers, I'm getting 655K reads and 291K writes. 
}The sheet that came with the drive said that it could handle an interleave
}of 1 and the manual for the HardFrame said to use an interleave of 1.
}Actually it said it was fast enough to keep up with all drives and to
}use an interleave of 1 for all drives.
} 
}Anyhow, I'm supprised that the 2090 and the 2090a aren't blazing along with
}the 296N.  It's a fairly fast drive, but a DMA controller should be able
}to keep up with it without any problem.
} 
}Rich Champeaux (rachamp@mbunix.mitre.org)

Rich is quite right to be astonished, the 2090x is definitivly able to keep
up and deliver speeds up to 1.2 MB/sec. In my HD controller review (a new 
revision is coming out in about 3 weeks) the 2090 delivered well over 
500 KB/sec with a Rodime SCSI drive. With a CDC Wren, several users reported 
speeds over 1 MB/sec (read). The 2090 handles an interleave of 1 with no 
problems. 

Something very subtle with Bill's setup is wrong, too bad these airline
tickets are that expensive, I would like to drop by and investigate this
phenomen myself. :-)

Regards,

- <CB>
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