On Wed, 2012-06-06 at 14:16 -0600, Myron Stowe wrote: > Hay Khalid, > > I've been following this discussion but still do not understand what the > perceived correct fix is for the situation you were originally trying to > circumvent - namely, stopping NIC devices from triggering DMA activity > upon receipt of an incoming packet. > > From the discussion it sounds like a driver, upon shutdown, can end > all active I/O > clearing the I/O queue, and also (?) shut down its DMA engine, and may > also go as far as disabling the Bus Master bit. > > What was occurring in the original issue - was the driver in question not > shutting down its DMA engine for some, possibly valid, reason? > > Thanks, > Myron Hi Myron, The last driver issue with kexec was reported on kexec mailing list in July of last year and that was with qla driver. From what H Peter Anvin described, the driver left DMA engine running. For the issue I found on an ia64 platform, it was so many years ago that you are now taxing my old and decrepit memory :) I am digging through old internal bug reports and will let you know once I find that original bug report. ==================================================================== Khalid Aziz Unix Systems Lab (970)898-9214 Hewlett-Packard khalid.aziz@xxxxxx Fort Collins, CO -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
