On 5/4/05, Matthew Wilcox <matthew@xxxxxx> wrote: > On Wed, May 04, 2005 at 07:51:12PM +0800, kylin wrote: > > 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 > > rubbish. MSI and Hotplug are independent of PCI Express and are used > by conventional PCI drivers today. Flow control, TC and VC are all part > of the same thing. sorry for my innocence,but all i want to say here is if the unMSI and unHotplug device driver would influence the normal speed in ONE common scenarios > > 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. > > Um, no, not really. There's very little hardware support for VC/TC at the > moment, so having software support for it isn't a priority. yeah ,even the bios will rarely support this > In addition, > it really depends how deep your PCI bus hierarchy is whether VC/TC will > have any effect on performance at all. have you seen the E7520 chipset ,sir? > Why is this question on linux-scsi anyway? because myu SCSI interface is connecting to the pcie bus:),love it and love the dog :) -- 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
