On Tue, Jun 26, 2007 at 11:09:40AM -0400, Muli Ben-Yehuda wrote: > On Tue, Jun 26, 2007 at 05:56:49PM +0200, Andi Kleen wrote: > > > > > - The IOMMU can merge sg lists into a single virtual block. This could > > > > potentially speed up SG IO when the device is slow walking SG > > > > lists. [I long ago benchmarked 5% on some block benchmark with > > > > an old MPT Fusion; but it probably depends a lot on the HBA] > > > > > > But most devices are SG-capable. > > > > Your point being? > > That the fact that an IOMMU can do SG for non-SG-capble cards is not > interesting from a "reason for inclusion" POV.
You misunderstood me; my point was that some SG capable devices can go faster if they get shorter SG lists. But yes for non SG capable devices it is also interesting. I expect it will obsolete most users of that ugly external patch to allocate large memory areas for IOs. That's a point I didn't mention earlier. > > Also the user interface for X server case needs more work. > > Is anyone working on it? It's somewhere on the todo list. -Andi - 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/
