[ntp:questions] Re: PPS source not always being chosen?
John Ackermann N8UR
jra at febo.com
Tue Aug 16 12:13:24 UTC 2005
Hal Murray wrote:
> I went browsing in the Linux kernel and couldn't find any code
> to disable the FIFO. I'm running a 2.4.16-NANO that's
> a couple of years old. Did I miss it and/or is it in newer
> I was expecting an ioctl but didn't find any code that turned
> off the FIFOs.
> I think I could easily hack the kernel. At least for serial ports
> using/emulating 16550A class chips which is what I've got.
You can do something close to disabling the fifo using the setserial
option "low_latency". I have a page with info and comparison of
timestamp performance using various serial options on both Linux and
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