PCIE有四种不同的规格，通过下图来了解下PCIE的其中2种规格

 

 

查看主板上的PCI插槽

  1. # dmidecode | grep --color "PCI"

 

 

不同PCIe版本对应的传输速率如下：

 

 

传输速率为每秒传输量GT/s，而不是每秒位数Gbps，因为传输量包括不提供额外吞吐量的开销位；
比如PCIe 1.x和PCIe 2.x使用8b/10b编码方案，导致占用了20% （= 2/10）的原始信道带宽。

GT/s —— Giga transation per second （千兆传输/秒），即每一秒内传输的次数。重点在于描述物理层通信协议的速率属性，可以不和链路宽度等关联。

Gbps —— Giga Bits Per Second （千兆位/秒）。GT/s 与Gbps 之间不存在成比例的换算关系。

PCIe 吞吐量（可用带宽）计算方法：

吞吐量 = 传输速率 * 编码方案

例如：PCI-e2.0 协议支持 5.0 GT/s，即每一条Lane上支持每秒钟内传输5G个Bit；但这并不意味着 PCIe 2.0协议的每一条Lane支持 5Gbps 的速率。

为什么这么说呢？因为PCIe 2.0 的物理层协议中使用的是8b/10b的编码方案。 即每传输8个Bit，需要发送10个Bit；这多出的2个Bit并不是对上层有意义的信息。

那么，PCIe 2.0协议的每一条Lane支持 5 * 8 / 10 = 4 Gbps = 500 MB/s 的速率。

以一个PCIe 2.0 x8的通道为例，x8的可用带宽为 4 * 8 = 32 Gbps = 4 GB/s。

PCI-e3.0 协议支持 8.0 GT/s, 即每一条Lane 上支持每秒钟内传输 8G个Bit。

而PCIe 3.0 的物理层协议中使用的是 128b/130b 的编码方案。 即每传输128个Bit，需要发送130个Bit。

那么， PCIe 3.0协议的每一条Lane支持 8 * 128 / 130 = 7.877 Gbps = 984.6 MB/s 的速率。

一个PCIe 3.0 x16的通道，x16 的可用带宽为 7.877 * 16 = 126.031 Gbps = 15.754 GB/s。

在 Linux 下要如何得知 PCI-E Bus 使用的是 Gen(Generation) 1 還是 Gen2 還是新一代的 Gen 3 雖然使用
#lspci 只要可以看到目前系統所有的裝置.但是好像看不到 PCI-E Bus 所採用的是哪一代的 PCI-E.

  1. root@XXX# lspci
  2. 00:00.0 Host bridge: Intel Corporation Haswell DRAM Controller (rev 06)
  3. 00:01.0 PCI bridge: Intel Corporation Haswell PCI Express x16 Controller (rev 06)
  4. 00:01.1 PCI bridge: Intel Corporation Haswell PCI Express x8 Controller (rev 06)
  5. 00:02.0 VGA compatible controller: Intel Corporation Haswell Integrated Graphics Controller (rev 06)
  6. 00:03.0 Audio device: Intel Corporation Haswell HD Audio Controller (rev 06)
  7. 00:14.0 USB controller: Intel Corporation Lynx Point USB xHCI Host Controller (rev 05)
  8. 00:16.0 Communication controller: Intel Corporation Lynx Point MEI Controller #1 (rev 04)
  9. 00:1a.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host Controller #2 (rev 05)
  10. 00:1c.0 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #1 (rev d5)
  11. 00:1c.4 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #5 (rev d5)
  12. 00:1c.5 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #6 (rev d5)
  13. 00:1d.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host Controller #1 (rev 05)
  14. 00:1f.0 ISA bridge: Intel Corporation Lynx Point LPC Controller (rev 05)
  15. 00:1f.2 IDE interface: Intel Corporation Lynx Point 4-port SATA Controller 1 [IDE mode] (rev 05)
  16. 00:1f.3 SMBus: Intel Corporation Lynx Point SMBus Controller (rev 05)
  17. 00:1f.6 Signal processing controller: Intel Corporation Lynx Point Thermal Management Controller (rev 05)
  18. 01:00.0 PCI bridge: PLX Technology, Inc. Unknown device 8724 (rev ca)
  19. 02:01.0 PCI bridge: PLX Technology, Inc. Unknown device 8724 (rev ca)
  20. 02:02.0 PCI bridge: PLX Technology, Inc. Unknown device 8724 (rev ca)
  21. 02:08.0 PCI bridge: PLX Technology, Inc. Unknown device 8724 (rev ca)
  22. 02:09.0 PCI bridge: PLX Technology, Inc. Unknown device 8724 (rev ca)
  23. 03:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  24. 03:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  25. 03:00.2 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  26. 03:00.3 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  27. 04:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  28. 04:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  29. 04:00.2 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  30. 04:00.3 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
  31. 06:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  32. 06:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  33. 07:00.0 PCI bridge: PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
  34. 08:01.0 PCI bridge: PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
  35. 08:08.0 PCI bridge: PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
  36. 08:09.0 PCI bridge: PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
  37. 08:0a.0 PCI bridge: PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
  38. 09:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  39. 09:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  40. 0e:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
  41. 0f:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
  42. root@XXX#
  1. root@XXX# lspci -tv
  2. -[0000:00]-+-00.0 Intel Corporation Haswell DRAM Controller
  3. +-01.0-[0000:01-06]----00.0-[0000:02-06]--+-01.0-[0000:03]--+-00.0 Intel Corporation I350 Gigabit Network Connection
  4. | | +-00.1 Intel Corporation I350 Gigabit Network Connection
  5. | | +-00.2 Intel Corporation I350 Gigabit Network Connection
  6. | | \-00.3 Intel Corporation I350 Gigabit Network Connection
  7. | +-02.0-[0000:04]--+-00.0 Intel Corporation I350 Gigabit Network Connection
  8. | | +-00.1 Intel Corporation I350 Gigabit Network Connection
  9. | | +-00.2 Intel Corporation I350 Gigabit Network Connection
  10. | | \-00.3 Intel Corporation I350 Gigabit Network Connection
  11. | +-08.0-[0000:05]--
  12. | \-09.0-[0000:06]--+-00.0 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
  13. | \-00.1 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
  14. +-01.1-[0000:07-0c]----00.0-[0000:08-0c]--+-01.0-[0000:09]--+-00.0 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
  15. | | \-00.1 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
  16. | +-08.0-[0000:0a]--
  17. | +-09.0-[0000:0b]--
  18. | \-0a.0-[0000:0c]--
  19. +-02.0 Intel Corporation Haswell Integrated Graphics Controller
  20. +-03.0 Intel Corporation Haswell HD Audio Controller
  21. +-14.0 Intel Corporation Lynx Point USB xHCI Host Controller
  22. +-16.0 Intel Corporation Lynx Point MEI Controller #1
  23. +-1a.0 Intel Corporation Lynx Point USB Enhanced Host Controller #2
  24. +-1c.0-[0000:0d]--
  25. +-1c.4-[0000:0e]----00.0 Intel Corporation I210 Gigabit Network Connection
  26. +-1c.5-[0000:0f]----00.0 Intel Corporation I210 Gigabit Network Connection
  27. +-1d.0 Intel Corporation Lynx Point USB Enhanced Host Controller #1
  28. +-1f.0 Intel Corporation Lynx Point LPC Controller
  29. +-1f.2 Intel Corporation Lynx Point 4-port SATA Controller 1 [IDE mode]
  30. +-1f.3 Intel Corporation Lynx Point SMBus Controller
  31. \-1f.6 Intel Corporation Lynx Point Thermal Management Controller
  32. root@XXX#

 

如果有裝置是 unknown 的,需要更新 /usr/local/share/pci.ids.gz 請參考更新方式 http://benjr.tw/node/88

先查询 Inetl 82599EB 网卡的识别号(bus:device.function)

  1. root@XXX# lspci | grep --color 82599
  2. 06:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  3. 06:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  4. 09:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  5. 09:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
  6. root@XXX#

在 PCI 的装置使用三个编号用来当作识别值,个别为 1. "汇流排(bus number)", 2. "装置(device number) 以及 3. "功能(function number)".

所以刚刚的 06:00.0 就是 bus number = 06 ,device number = 00 function = 0 .

这3个编号会组合成一个 16-bits 的识别码,

汇流排(bus number) 8bits 2^8 至多可连接 256 个汇流排(0 to ff),

装置(device number) 5bits 2^5 至多可接 32 种装置(0 to 1f) 以及

功能(function number) 3bits 2^3 至多每种装置可有 8 项功能(0 to 7).

关于更多 #lspci 的资讯请参考 http://benjr.tw/node/543

然后查看vendor id和device id

  1. root@XXX# lspci -n | grep -i 06:00.0
  2. 06:00.0 0200: 8086:10fb (rev 01)
  3. root@XXX#

Linux 使用 Class ID + Vendor ID + Device ID  來代表裝置,如剛剛的  0200: 8086:10fb 所代表裝置名稱為 (Class ID = 0200 , Vendor ID = 8086, Device ID = 10fb)

最后查看指定PCI设备的带宽

  1. root@XXX# lspci -n -d 8086:10fb -vvv | grep --color Width
  2. LnkCap: Port #9, Speed 5GT/s, Width x8, ASPM L0s, Latency L0 <1us, L1 <8us
  3. LnkSta: Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  4. LnkCap: Port #9, Speed 5GT/s, Width x8, ASPM L0s, Latency L0 <1us, L1 <8us
  5. LnkSta: Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  6. LnkCap: Port #1, Speed 5GT/s, Width x8, ASPM L0s, Latency L0 <1us, L1 <8us
  7. LnkSta: Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  8. LnkCap: Port #1, Speed 5GT/s, Width x8, ASPM L0s, Latency L0 <1us, L1 <8us
  9. LnkSta: Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  10. root@XXX#

 

LnkSta : 目前系統所提供的速度 PCI-Express 2.0 ( 5GT/s )

LnkCap : 裝置目前所採用的速度.

LnkSta 和 LnkCap 這兩個速度有可能不一樣 , 典型情况下: 系統所提供的是 PCI Express 是 3.0 但裝置還是使用 2.0 的.

以上就是本次介绍的相关知识点，感谢大家的学习和对的支持。

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