Date: Thu, 30 Jan 1997 11:23:44 -0800 (PST) From: Chris Timmons <skynyrd@opus.cts.cwu.edu> To: freebsd-hardware@freebsd.org Subject: DE500-AA (w/21140-AC) ~7% slower than -XA Message-ID: <Pine.BSF.3.95.970130105250.19079B-100000@opus.cts.cwu.edu>
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The good news is that the most recent DEC DE500 10/100 PCI ethernet
adapters plug in and go just fine under -current. The ostensible
differences between the 'classic' DE500-XA boards which we have reliably
run under FreeBSD for a great while are:
The DE500-AA has a 21140-AC chip rather than the -AB on the last
-XA adapter we bought.
The -AA has an EPROM socket.
The -AA seems to be about 7% slower
So for example, running an -XA as a 10baseT adapter, I routinely see about
~1M/sec ftp times for a given 40MB file, while when I replace the -AA with
an -XA in the same machine and copy the same file (over and over again) I
get ~930K/sec.
Would anyone care to conjecture if the slowdown is intrinsic to the HW or
perhaps something that could be addressed in the driver?
-Chris
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