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by mbbrutman 1065 days ago
Yep, at this point it's just continually busy.

For the next iteration I've got to put a better Ethernet card on it. The Xircom PE3-10BT device is nice because it's convenient, but the bandwidth would be 2x higher with a real Ethernet card on the bus.

And normally this machine is idle so the speed and bandwidth are not a problem. Right now it's very popular. :)
1 comments
lucb1e 1065 days ago
What kind of speed does that Xircom get?

I don't know what's on the site, maybe it's busy uploading data to various people, but usually the original 10mbps ethernet is enough to serve most ~light websites (anything that is not as heavy as youtube or an image blog basically) to the hacker news homepage, and I'm not getting synacks so this is not the web server (layer 7) being slow

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mbbrutman 1065 days ago
The Xircom is pretty bad, as it costs a lot to do the I/O through the parallel port. Just using TCP/IP sockets (no disk access or processing) the machine can send and received about 42KB/sec. A better adapter can do nearly 3x that on the same machine.

Performance measurements here: https://www.brutman.com/mTCP/mTCP_Performance.html

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anyfoo 1065 days ago
So about 1Mbps max with a good adapter? Wow, more than I thought... yeah, a hard disk of the era, not even AT bus, most likely won't be able to keep up with that, heh.
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anyfoo 1065 days ago
I'm repeating myself a bit, but, dude, it's an 8088 (EDIT: ok, technically a NEC V20, pretty negligible though). It has an 8 bit wide bus. It runs at 4.77MHz and needs many cycles (at least 4? more?) per instruction. With a parallel port adapter, not even an 8 bit ISA one. I haven't done the math, not even on an envelope, but I somehow doubt the Ethernet adapter is the bottleneck here...
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