On Wed, Nov 11, 2009 at 05:44:59PM -0500, Richard Frank wrote: > Would anyone like to through out the list of HCAs that do this... I > can guess at a few... and can ask the vendors directly.. if not.. . > > It would be much nicer to not hardcode names of adapters.. but that won't > stop us.. :)
Isn't it more complex than this? AFAIK the PCI-E standard does not specify the order which data inside a single transfer becomes visible, only how different transfers relate. To work on the most agressive PCI-E system the HCA would have to transfer the last XX bytes as a seperate PCI-E transaction without relaxed ordering. This is the sort of thing that might start to matter on QPI and HT memory-interleaved configurations. A multi-cache line transfer will be split up and completed on different chips - it may not be fully coherent 100% of the time. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
