Messages in this thread | | | Date | Sun, 15 Jun 2003 00:11:07 -0700 (PDT) | Subject | Re: problem with blk_queue_bounce_limit() | From | "David S. Miller" <> |
| |
From: Anton Blanchard <anton@samba.org> Date: Sun, 15 Jun 2003 17:06:11 +1000
Dave, we talked about this ages ago as a possible alternative to skb recycling and persistent IOMMU mappings for those skbs.
Unfortunately you need a hash to map from all of memory to a pci bus address for each host bridge (well IOMMU), and so far I cant think of anything that wouldnt chew gobs of RAM.
The hash table need not be sized wrt. ram, but rather to the expected amount of "DMA in flight" you can expect for the system.
You have to make these tables per-IOMMU anyways, which breaks down the problem much further.
ROFL, whose workstation name is krispykreme? :-) I just noticed that. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |