Re: [SERIAL, -mm] CRC failure

[Kenneth Parrish <Kenneth.Parrish@familynet-international.net>]

-=> In article 14 Dec 05  18:06:44, patrakov@ wrote to Kenneth Parrish <=-

 pa> Does the error rate vary if you run a CPU hog (e.g. cat
 pa> /dev/urandom
 >/dev/null) or glxgears in parallel to minicom?
The system has been idle. Increasing the load should worsen the errors,
but they're pretty frequent so i might not see.
The computer's ISA-PNP Crystal Sound CS4235 soldered onto the
motherboard sounds best with the main pci latency timer set to 0, but
this gives serial overruns, so i've made a small 'mon', or modem on,
script to reset this:

# mon
/etc/rc.d/rc.acpidyn-modem restart
/sbin/setpci -v -s 00:00.0 LATENCY_TIMER=20

and another for when the modem's not needed, 'moff'

# moff
/etc/rc.d/rc.acpidyn restart
/sbin/setpci -v -s 00:00.0 LATENCY_TIMER=0
/sbin/rmmod 8250 serial_core

and this seems to work well.  The sound worsens as you increase the
00:00.0 LATENCY_TIMER.

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