I've finally had the opportunity to bisect this regession down to: PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources commit 5b28541552ef5eeffc41d6936105f38c2508e566 Author: Yinghai Lu <yinghai@xxxxxxxxxx> Date: Mon May 19 17:01:55 2014 -0600 The patch is quite involved so could someone with familiarity with the allocation strategies take a look please? https://bugzilla.kernel.org/show_bug.cgi?id=81431 -- 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