Messages in this thread | | | From | brian@worldcon ... | Date | Fri, 19 Nov 1999 23:10:56 -0800 | Subject | Re: Kodak DC-265 overrunning linux serial driver? |
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"Ted" == Theodore Y Ts'o <tytso@mit.edu> "jim" == Jim Thompson <jim.thompson@pobox.com>
> Ted> Are you using an old IDE controller that does programmed I/O > Ted> (i.e., no DMA?). If so, look at the man page for hdparm's -u > Ted> option. That should make your problem go away. (The > Ted> explanation for the -u option will also explain why this isn't > Ted> the default.) >
jim> Ted, I get the same buffer overrun on two modern systems: a brand-new jim> Dell I3700 laptop, and a SCSI-only P2B-S motherboard. Furthermore, the jim> problem will occur when there is relatively little disk activity. On jim> the other hand, the error is much more frequent when there's significant jim>CPU load.
The system I am running 2.3.28 is an AMD K6-3/400 with a relatively high performance SCSI subsystem, actually has a 64 PCI SCSI controller, admittedly plugged into a 32bit slot of an x86 system.
This would eliminate the IDE problem Ted spoke of in a related email.
However you are also having the problem with a SCSI only MB. hmmmm.
I guess you are running into the evil "other" devices that Ted mentioned.
I've noticed the CPU load related underruns a little. I'll load up my 2.3.28 systems CPU and see what happens, since it otherwise works fine.
I think it would be nice if Linux had a serial subsystem that supports 115200 with a standard 16550A. And apparently is does. Hopefully the "other" devices will work toward this end too.
-- Brian Litzinger <brian@litzinger.com>
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