> > Yes, but the 16450 works on Win95, linux 2.0.33, and linux 2.1.xxx
> > thru the mid 80's.
>
> Do you know which actual 2.1.8x broke it. That could be important since
> it will identify which set of changes caused the problem
>
No, that was just a guess. I was running the 1.1.xxx series, and then
when 2.0's came out I stayed with those for quite a while; and then
somewhere in the 2.1.80's I started back with the development kernels, and
didn't notice the problem. I wasn't looking for it, either. I did go
back and try 2.1.106 as part of this thread, and it was qualititively
better. But as I posted a few hours ago, executing `hdparm -u1 /dev/hda`
seems to have fixed the problem; so it's pretty clearly an interrupt
latency problem (esp. with non-buffered uarts). Seems like as the kernel
adds more stuff, the problem became progressively worse.
dave
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