该文档介绍了如何在系统下查看PCIE 设备带宽和速率
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.
[root@benjr ~]# lspci
00:00.0 Host bridge: Intel Corporation 3200/3210 Chipset DRAM Controller (rev 01)
00:01.0 PCI bridge: Intel Corporation 3200/3210 Chipset Host-Primary PCI Express Bridge (rev 01) 00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 02)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA AHCI Controller 00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722 Gigabit Ethernet PCI Express 04:03.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
09:00.0 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03) 09:00.1 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03) 0c:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
如果有裝置是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-E bus 的速度上限.
PCI Express 1.1
使用兩對低電壓的差位訊號排線(low-voltage differential signaling pairs)，
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 2.5
G x 2 = 5Gbps 的頻寬.
x1 2.5Gbps(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 (250 MB/sec)
x4 10Gbps 8Gbps (1 GB/sec)