On one hand ,hardwarely,as it is always said, PCIE provides the superexcellent performance comparing with the PCI and PCI -X On the other ,softwarely,in most the application scenarios i have met , the PCIE equipment will have to use the pci-compatible driver first in linux. because the Configuration head is pci compatible in the first 256 byte , it is allowed and really works. i know if we use the conventional Device Driver for pcie equipment, the advanced option such as MSI ,Flow Control ,TC ,VC and hotplug are unavailable, i also know that the speed is mainly the problem of Bandwidth and Clocking. Still i know that the Trafic control mechanism is good for the arbitration and thus improve the performance just like the TCP protocol ways. So my conclusion is : the conventional Device driver will not be the bottle neck of the PCIE performance as long as only speed is concerned ,and the advanced options are only Application-related. here allow me just compare it with the network protocol , oh ,i just use the IP protocol ,with out the TCP /UDP way. is that right ?or any wise can give some advice and -- we who r about to die,salute u! - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
