Linux系統(tǒng)下查看PCIE卡的帶寬以及速率

本文格式為Word版，下載可任意編輯——Linux系統(tǒng)下查看PCIE卡的帶寬以及速率在Linux下要如何得知PCI-EBus使用的是Gen(Generation)1還是Gen2還是新一代的Gen3雖然使用#lspci只要可以看到目前系統(tǒng)所有的裝置.但是好像看不到PCI-EBus所採用的是哪一代的PCI-E.

[root@benjr~]#lspci

00:00.0Hostbridge:IntelCorporation3200/3210ChipsetDRAMController(rev01)

00:01.0PCIbridge:IntelCorporation3200/3210ChipsetHost-PrimaryPCIExpressBridge(rev01)00:1a.0USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#4(rev02)00:1a.1USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#5(rev02)00:1a.2USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#6(rev02)00:1a.7USBController:IntelCorporation82801I(ICH9Family)USB2EHCIController#2(rev02)00:1c.0PCIbridge:IntelCorporation82801I(ICH9Family)PCIExpressPort5(rev02)00:1c.1PCIbridge:IntelCorporation82801I(ICH9Family)PCIExpressPort6(rev02)00:1c.2PCIbridge:IntelCorporation82801I(ICH9Family)PCIExpressPort1(rev02)

00:1d.0USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#1(rev02)00:1d.1USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#2(rev02)00:1d.2USBController:IntelCorporation82801I(ICH9Family)USBUHCIController#3(rev02)00:1d.7USBController:IntelCorporation82801I(ICH9Family)USB2EHCIController#1(rev02)00:1e.0PCIbridge:IntelCorporation82801PCIBridge(rev92)

00:1f.0ISAbridge:IntelCorporation82801IR(ICH9R)LPCInterfaceController(rev02)

00:1f.2SATAcontroller:IntelCorporation82801IR/IO/IH(ICH9R/DO/DH)6portSATAAHCIController00:1f.3SMBus:IntelCorporation82801I(ICH9Family)SMBusController(rev02)

03:00.0Ethernetcontroller:BroadcomCorporationNetXtremeBCM5722GigabitEthernetPCIExpress04:03.0VGAcompatiblecontroller:ATITechnologiesIncES1000(rev02)

09:00.0FibreChannel:QLogicCorp.ISP2432-based4GbFibreChanneltoPCIExpressHBA(rev03)

09:00.1FibreChannel:QLogicCorp.ISP2432-based4GbFibreChanneltoPCIExpressHBA(rev03)

0c:00.0SCSIstoragecontroller:LSILogic/SymbiosLogicSAS1064ETPCI-ExpressFusion-MPTSAS

假使有裝置是unknown的,需要更新/usr/share/hwdata/pci.ids請參考更新方式http://benjr.tw/node/88

首先我們先來複習一下PCI-Ebus的速度上限.

?

PCIExpress1.1

使用兩對低電壓的差位訊號排線（low-voltagedifferentialsignalingpairs），分別各跑2.5GBit/s速度,下面的速度是以單對的速度而言.x1有兩對2.5Gx2=5Gbps的頻寬.

x12.5Gbps(20%overhead-PCI-e在每八個位元的資料串上用十位元來加以編碼)2Gbps(250MB/sec)x410Gbps8Gbps(1GB/sec)

x820Gbps16Gbps(2GB/sec)x1640Gbps32Gbps(4GB/sec)

?

PCIExpress2.0

PCI-SIG的PCIExpress2.0規(guī)格，新版每條Lane的單向頻寬從2.5Gbps倍增到5Gbps.

x15Gbps(20%overhead-PCIe並且在每八個位元的資料串上用十位元來加以編碼)4Gbps(500MB/sec)(5G*0.8)Mb/8=500MB

x420Gbps16Gbps(2GB/sec)x840Gbps32Gbps(4GB/sec)x1680Gbps64Gbps(8GB/sec)

我的系統(tǒng)上有一張QlogicChipset為2432的4GFiberChannelHBA,要如何得知目前系統(tǒng)的PCI-EBus的速度呢!!首先要查出這張HBA的裝置名稱.

[root@benjr~]#lspci-n00:00.00600:8086:29f0(rev01)00:01.00604:8086:29f1(rev01)00:1a.00c03:8086:2937(rev02)00:1a.10c03:8086:2938(rev02)00:1a.20c03:8086:2939(rev02)00:1a.70c03:8086:293c(rev02)00:1c.00604:8086:2948(rev02)00:1c.10604:8086:294a(rev02)00:1c.20604:8086:2940(rev02)00:1d.00c03:8086:2934(rev02)00:1d.10c03:8086:2935(rev02)00:1d.20c03:8086:2936(rev02)00:1d.70c03:8086:293a(rev02)00:1e.00604:8086:244e(rev92)00:1f.00601:8086:2916(rev02)00:1f.20106:8086:2922(rev02)00:1f.30c05:8086:2930(rev02)03:00.00200:14e4:165a

04:03.00300:1002:515e(rev02)09:00.00c04:1077:2432(rev03)09:00.10c04:1077:2432(rev03)0c:00.00100:1000:0056(rev02)

可以看到目前Qlogic2432的PCI名稱以及裝置名稱為09:00.00c04:1077:2432(rev03)先來看看這些數(shù)字所代表的意義.前面的3個數(shù)字\是各代表什麼意思.

在PCI的裝置使用三個編號用來當作識別值,個別為1.\匯流排(busnumber)\2.\裝置(devicenumber)以及3.\功能(functionnumber)\

所以剛剛的09:00.0就是busnumber=09,devicenumber=00function=0.

這3個編號會組合成一個16-bits的識別碼,

1.匯流排(busnumber)8bits2^8至多可連接256個匯流排(0toff),

2.裝置(devicenumber)5bits2^5至多可接32種裝置(0to1f)以及

3.功能(functionnumber)3bits2^3至多每種裝置可有8項功能(0to7).關(guān)於更多#lspci的資訊請參考http://benjr.tw/node/543

不過在Linux使用ClassID+VendorID+DeviceID來代表裝置,如剛剛的0c04:1077:2432所代表裝置名稱為(ClassID=0c04,VendorID=1077,DeviceID=2432).

???

0c04:class0c04表示是\Channelcontroller\1077:vendorID1077製造廠商\Corp\

2432:deviceID2432產(chǎn)品名稱\4GbFiberChanneltoPCIExpressHBA\

你問我怎麼知道ID與名稱是怎麼對應(yīng)的很簡單直接參考/usr/s