On Mer, 2005-11-23 at 23:30 +0100, Andi Kleen wrote: > Another proposal was swiotlb.
I was hoping Intel might have rediscovered the IOMMU by then and be back on feature parity with the VAX 11/750 > > But it's not clear it's a good idea: a lot of these applications prefer to > have the target in cache. And IOAT will force it out of cache. This is true for some cases but not all for iotlb CPU generated data going out that won't be rewritten immediately should be a cheap path not needing the cache. Incoming data would invalidate the cache anyway if it arrives by DMA so the ioat would move it asynchronously of the CPU without cache harm Might also be interesting to use one half of a hypedthread CPU as a copier using the streaming instructions, might be better than turning it off to improve performance ? Alan - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
