On Wednesday 14 November 2007 12:55, Srihari Vijayaraghavan wrote: > [Sorry to reply to my own email thread] > > Srihari Vijayaraghavan <sriharivijayaraghavan@xxxxxxxxxxxx> wrote: > ... > > > No problems. Here's the log of unworking kernel with IOMMU turned on. > > Basically it goes on reseting the SATA ports throwing many errors (none > > are present in 2.6.23 or on 2.6.24-rc with mem=3500M) for many minutes at > > which point I do a power reset :-(. > > > > Also the log of the working kernel with IOMMU but with mem=3500M is also > > attached for the record. It's basically the same above kernel just with > > the added parameter. > > Gentlemen, > > This changeset has introduced a regression in 2.6.24-rc, such that my > machine boots no more: Hmm, you got an AHCI controller that does not do 64bit DMA masks? Or do you have CONFIG_IOMMU_DEBUG enabled? Anyways, not being able to deal with merged SG lists must be some driver or hardware bug. I would stick some printks into gart_map_sg() and try to find out where the failing DMA is initiatiated and then split it into multiple IO submissions at the caller level. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
