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    SubjectRe: SR-IOV problem with Intel 82599EB (not enough MMIO resources for SR-IOV)
    On 11/09/2012 10:26 AM, Bjorn Helgaas wrote:
    > [+ linux-pci, Yinghai]
    >
    > On Thu, Nov 8, 2012 at 8:59 PM, Jason Gao<pkill.2012@gmail.com> wrote:
    >>> The BIOS in your machine doesn't support SR-IOV. You'll need to ask the manufacturer for a BIOS upgrade, if in fact one is available. Sometimes they're not.
    >>
    >> very thanks Greg,my server Dell R710 with latest BIOS version and
    >> option for SR-IOV(SR-IOV Global Enable->Enabled) opened,I'm confused
    >> that Does R710 provide full support for SR-IOV, kernel or ixgbe
    >> driver's bug? but I'm not sure where the problem lies,anyone has any
    >> experience about this? .
    >
    > Linux normally uses the resource assignments done by the BIOS, but it
    > is possible for the kernel to reassign those. We don't have good
    > automatic support for that yet, but on a recent upstream kernel, you
    > can try "pci=realloc". I doubt this option is in CentOS 6.3, though.
    >
    Try moving the device into a different slot.
    You may be trying it in a non-ARI slot in the 710; that is a problem
    in RHEL6 (needing to realloc bus &/or mem-space).
    A non-ARI slot will want to use one bus number per VF.... which will
    be problematic.
    I know I've seen ixgbe's (& their vfs's) working on a dell 710;
    but they may also be one of those systems that has a slot off the ich10
    with no ARI support.

    > If an upstream kernel with "pci=realloc" still doesn't work, please
    > post the entire dmesg log.
    > --
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