On Wed, 2009-11-18 at 10:43 +0000, Dave Higton wrote: Hello Dave, Sorry for the late reply. Somehow missed you message due to excessive F12-release noise. :) > OK. I've just been Googling for warn_slowpath, but although I've > found lots of examples, I don't know what it means. My guess is > that it's used as a diagnostic by some code, probably kernel code, > so the next challenge is to find where it was called from. Yes? I tried tracking down the kernel code... > > > Are you getting a real crash or some kind of failure. > > More information since my original posting: fillDVD2 is a test app > that I wrote as part of an effort to test the ability of Fedora to > write DVD-RAM discs. We have experienced numerous failures, but > we don't yet understand why. > > fillDVD2 wasn't testing for errors. An error occurred somewhere, > but fillDVD2 carried on trying to write to the DVD-RAM disc. This > doesn't work; once DVD-RAM writing has failed, no subsequent > attempts will succeed. The disc has to be ejected. > > I revised fillDVD2 to stop on an error. A subsequent test showed > that the first error, at a similar point (when the disc was within > a few hundred MB of getting full), was "I/O error". Not very > meaningful to me. Other than the WARN_ON, are you seeing anything useful in the kernel log? > uname -a says: > 2.6.27.38-170.2.113.fc10.i686 #1 SMP Wed Nov 4 17:55:39 EST 2009 > i686 i686 i386 GNULinux > We originally wanted to use CentOS but were never able to solve > a real-time problem it gave us: we need to service interrupts from > our cards every 32 ms. Normally the IRQ is active for no more than > 8 us before it's serviced; under CentOS this would often exceed 20 ms > and we would lose data. > Weird. 8us sounds right under both RHEL and Fedora. Care to take it off ML? - Gilboa -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
