linux-kernel - Re: [Update][PATCH] PCI: Document PCIE BUS MPS parameters

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Message-ID: <51009A7F.6050104@huawei.com>
Date:	Thu, 24 Jan 2013 10:20:47 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Randy Dunlap <rdunlap@...radead.org>
CC:	Rob Landley <rob@...dley.net>, Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jon Mason <jdmason@...zu.us>, <linux-pci@...r.kernel.org>,
	Andrew Murray <andrew.murray@....com>,
	Hanjun Guo <guohanjun@...wei.com>, <jiang.liu@...wei.com>
Subject: Re: [Update][PATCH] PCI: Document PCIE BUS MPS parameters

On 2013/1/24 10:02, Randy Dunlap wrote:
> On 01/23/13 17:55, Yijing Wang wrote:
>> Hi Randy,
>>    Thanks for your review and comments! please refer to inlined comments below.
>>
>> On 2013/1/24 7:39, Randy Dunlap wrote:
>>> On 01/23/13 04:28, Yijing Wang wrote:
> 
>>>
>>> What is (are) MRRS?
>>
>> MRRS is "Max Read Request Size" and MPS is "Max Payload Size".
>> Need use "Max Read Request Size" instead of MRRS ?
> 
> Where is MRRS documented?

The description of MRRS can be found at PCIe Spec 2.0/3.0 7.8.4 Device Control Register.

> 
> I would probably do it like so:
> 
> Also set MRRS (Max Read Request Size) to the ....

Hmm, I will explain MPS and MRRS when they appear first time like,

pcie_bus_tune_off   Disable PCIe MPS (Max Payload Size) turning and using
		the BIOS-configured MPS defaults.

pcie_bus_perf	......Also set MRRS (Max Read Request Size) to the......

Thanks!
Yijing

> 


-- 
Thanks!
Yijing

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