Date: Sun, 3 Sep 1995 07:36:08 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, davidg@Root.COM Cc: hackers@freebsd.org Subject: Re: novell ne2000 cards with FreeBSD...opinions? Message-ID: <199509022136.HAA13401@godzilla.zeta.org.au>
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>>Shared memory on my NE2000/WD8013EBT card is 50% faster, but that isn't >>saying much. The driver spends half its time bcopying to the shared >>memory instead of more that half its time doing explicit i/o instructions. >>The speeds are something like: >> >> i/o instructions: 2MB/sec >> bcopy: 3MB/sec >> IDE disk controllers: 3.3MB/sec PIO mode 0 (or 1?) spec >> 8MHz ISA bus max: 4MB/sec > Your bus is slow. The 8013 usually has memory speeds of 4MB/sec. Isn't a slow bus the usual case? On one of my systems, the (AMI) BIOS has options for 1-5 bus wait states but not 0. I use 1. There are options to use a faster bus speed but I don't use them. On another of my systems, the (AMI) BIOS doesn't have any bus options. It apparently defaults to 2 bus wait states. I timed the speeds more carefully using microtime() before and after each relevant bcopy and insw/outsw: System 1 (486DX/33,1ws) System 2 (486DX2/66) NE2000 16 bit i/o instructions 2.0byte/us test not done WD8013EBT shared memory 3.5byte/us 3.0 byte/us IDE 16 bit i/o instructions 3.0byte/us test not done Bruce
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