lkml.org 
[lkml]   [1999]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: Kodak DC-265 overrunning linux serial driver?

"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>


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:55    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site