On Fri, 22 Jun 2007 15:43:00 -0700 Yinghai Lu <[EMAIL PROTECTED]> wrote:
> Eric W. Biederman wrote: > > The original design came from thinking about systems where using the iommu > > was mandatory. I think we almost always reserve memory below 1G for the > > kexec > > on panic kernel so it really shouldn't be an issue in that case. Except > > we need to pass an option to force not using the iommu. I don't think > > noiommu or swiotlb is going to make any real difference. > > > > So I'm totally in favor of turning off features if we don't need them and we > > don't take a tremendous performance hit. (People get grumpy when writing > > all of memory to disk takes completely unreasonable amounts of time). > > > So you prefer to > add diable_gart in shutdown or suspend func and let kexec to use swiotlb > comand line? Don't disable it, just don't touch it or any of its mappings. Leave it *alone*, and use swiotlb. That'll maximise the ability to recover stuff from the kexec kernel (since for one you may want to dump the gart when a 3d app goes kerblam) Alan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
