On Sat, Jun 02, 2007 at 06:21:46PM +0300, Muli Ben-Yehuda wrote: > On Fri, Jun 01, 2007 at 10:26:01PM +0200, Andi Kleen wrote: > > > Normally swiotlb doesn't even try to bounce when dma mask is <= > > end_pfn so something must be very wrong in your kernel. It > > definitely isn't a mainline kernel. If this happens in Xen then Xen > > just needs fixing -- it should not try to bounce when the normal > > kernel wouldn't. > > Xen needs to bounce when the requested buffer is not contiguous in > machine memory (and indeed uses swiotlb for that).
Then it should just restrict the sg list merging at the block layer to never merge into anything larger than a page. Then this cannot happen or only very rarely. -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/
