Date: Sun, 10 Aug 1997 22:51:13 -0700 From: Mike Haertel <mike@ducky.net> To: dg@root.com Cc: freebsd-hackers@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG Subject: Re: question about "ed" driver performance on ASUS SP3G & 486DX4/100 Message-ID: <199708110551.WAA03617@ducky.net>
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>>On the 486 box, it takes about 15.5 seconds. On the Pentium box >>(which worked for the NFS install) it takes about 14.5 seconds. >> >>Either of these is just slightly faster than 1 MB/sec and nowhere >>near the claimed 4 MB/sec. Perhaps my board is pessimal and the >>Pentium box, being just a hair faster, is fast enough to keep up? > > My 4MB/second number comes from doing a similar test in the device driver >using bcopy at system startup. I don't know why your results are so slow, >but I do recall seeing unusually low performance numbers from a P6 system >that I once tested - I seem to recall they were about half speed or so, but >I didn't investigate further. > Just for kicks, you might try doing 16 bit copies rather than 32bit >copies and see if your results are affected. This was a 486 system, not a P6 system. (The problem I am having is that the 486 cannot keep up with the data coming from the P6.) I tried 16-bit copies; they were a little slower (about 16 and 18 seconds on the P5-90 and 486-100 respectively). Further information: I have no idea what brand the board is; I got it as scrap. The NIC is a WDC83C690. I just checked the card edge connector and all 16 data lines really *are* there, so I don't think it's an 8-bit board in disguise.
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