Messages in this thread | | | Subject | Re: SCSI breakage on non-cache coherent architectures | From | Benjamin Herrenschmidt <> | Date | Tue, 20 Nov 2007 06:55:16 +1100 |
| |
> I'd like to be rid of it inside the command for various reasons: every > command has one of these, and they're expensive in the allocation (at 96 > bytes). There's no reason we have to allocate and free that amount of > space with every command. In theory, the number of these is bounded at > the queue depth, in practice, there's usually only one, and this DMA > alignment issue does requires most drivers to double copy.
Do you have a plan for short term here ? I'd like something fixed for .25, so I may have to introduce a __dma_aligned macro of some sort to deal with that in the meantime...
Ben.
- 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/
| |