On 01/23/13 04:28, Yijing Wang wrote:
> Document PCIE BUS MPS parameters pcie_bus_tune_off, pcie_bus_safe,
> pcie_bus_peer2peer, pcie_bus_perf into Documentation/kernel-parameters.txt.
> These parameters were introduced by Jon Mason <[email protected]> at
> commit 5f39e6705 and commit b03e7495a8. Document these into
> kernel-parameters.txt can help users to understand and use the parameters.
>
> Signed-off-by: Yijing Wang <[email protected]>
> ---
> Documentation/kernel-parameters.txt | 15 +++++++++++++++
> 1 files changed, 15 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt
> b/Documentation/kernel-parameters.txt
> index 363e348..1fb269b 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -2227,6 +2227,21 @@ bytes respectively. Such letter suffixes can also be
> entirely omitted.
> This sorting is done to get a device
> order compatible with older (<= 2.4) kernels.
> nobfsort Don't sort PCI devices into breadth-first order.
> + pcie_bus_tune_off Disable PCI-E MPS turning and using
> + the BIOS configured MPS defaults.
BIOS-configured
> + pcie_bus_safe Use the smallest common denominator MPS
> + of the entire tree below a root complex for
> every device
> + on that fabric. Can avoid inconsistent mps
> problem caused
s/mps/MPS/
i.e., use "MPS" consistently.
> + by hotplug.
> + pcie_bus_perf Configure pcie device MPS to the largest
> allowable
> + MPS based on its parent bus. And also set MRRS
> to the
"And also" is redundant. Just say Also.
What is (are) MRRS?
> + largest supported value but cannot be
> configured larger
> + than the MPS the device or the bus can support
> for Max
> + performance.
> + pcie_bus_peer2peer Make the system wide MPS the smallest
system-wide
> + possible value (128B).This configuration could
> prevent it
^ Space before "This"
> + from working by having the MPS on one root port
> different
> + than the MPS on another.
> cbiosize=nn[KMG] The fixed amount of bus space which is
> reserved for the CardBus bridge's IO window.
> The default value is 256 bytes.
>
--
~Randy
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