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From: kslee@csd.hku.hk (Lee Kwok Shing (***) (~))
Subject: Re: Improving data transfer rates of `3x' drive?
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Date: Wed, 15 Jun 1994 03:13:11 GMT
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roger m squires (rsquires@unm.edu) wrote:
: I have been experimenting with the `cdspeed.zip' routine
: available on garbo.uwasa.fi.  This routine was apparently
: not designed to test above 150k/sec, but in any case it
: indicates a top `Data Streaming Xfer rate' of ~320k/sec
: for my drive.
: 
: The cd-rom is a NEC CDR-510 3xi, hooked to a Pro-Audio
: Spectrum 16, on a PCI DX2/50.
: 
: Shouldn't this drive be capable of ~450k/sec, and what is
: the most likely bottleneck:  the soundcard, software driver,
: or CPU?  I'd appreciate any tips or pointers.
: 
: rms
	I have done a speed test by using MPC Wizard 2.0.
	In a computer 386DX40, 8MB RAM, NEC 3Xi+PAS SCSI,
	the 100% CPU transfer rate is ~320K/sec,
	but in a 486DX2-66, 8Mb RAM, same CD-ROM+Adaptec 2842VL SCSI,
	the 100%CPU and 60%CPU gives ~448K/sec.

	So I think the SCSI controller would be the bottleneck.

	Hope this help !
--
Lee Kwok Shing (Little)
Internet : kslee@csd.hku.hk
	   kslee@hkuxa.hku.hk
(***)