On 09/02/2015 10:45 PM, Luis R. Rodriguez wrote: > On Mon, Aug 31, 2015 at 11:05:33AM -0500, Stuart Hayes wrote: >> Increase the range of chunk sizes tried in mtrr_cleanup() so it is able >> to map large memory configs into MTRRs. >> >> Currently, mtrr_cleanup() will fail with large memory configurations, >> because it limits chunk_size to 2GB, which means that each MTRR can only >> cover 2GB of memory. With a memory size of, say, 256GB, and ten variable >> MTRRs (such as some recent Intel CPUs have), it is not possible to set up >> the MTRRs to cover all of memory. > > Linux drivers no longer use MTRR so why is the cleanup needed, ie, what would > happen if the cleanup is just skipped in your case ?
The infiniband & video drivers still use MTRR (or at least it was my understanding that they do). In any case, Stuart -- could you try booting with 'disable_mtrr_cleanup' as a kernel parameter? P. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
