lspci -vv | more
LnkSta: Speed 5GT/s, Width x4,
PCIe 버전 * Lane = 대역폭
- 예를 들어 10Gbps NIC으면 적어도 PCIe v2 x4 는 되어야 2000MB
https://calomel.org/network_performance.html
(type) (bus speed) * (bus width) / 8 = (speed in Megabytes/second)
PCI 66 MHz * 32 bit / 8 = 264 MB/s
PCIe v1 2500 Mhz * 32 1 bit lanes / 8 = 250 MB/s (minus 20% overhead)
PCIe v2 x1 5000 Mhz * 1 1 bit lane / 8 = 500 MB/s (minus 20% overhead)
PCIe v2 x2 5000 Mhz * 2 1 bit lanes / 8 = 1000 MB/s (minus 20% overhead)
PCIe v2 x4 5000 Mhz * 4 1 bit lanes / 8 = 2000 MB/s (minus 20% overhead)
PCIe v2 x8 5000 Mhz * 8 1 bit lanes / 8 = 4000 MB/s (minus 20% overhead)
PCIe v2 x16 5000 Mhz * 16 1 bit lanes / 8 = 8000 MB/s (minus 20% overhead)
PCIe v2 x32 5000 Mhz * 32 1 bit lanes / 8 = 16000 MB/s (minus 20% overhead)
PCIe v3 x32 5000 Mhz * 32 1 bit lanes / 8 = 19700 MB/s (minus 1.5% overhead)
lspci -t -v
\-[0000:00]-+-00.0 Intel Corporation 5500 I/O Hub to ESI Port
+-01.0-[01]----00.0 LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
+-03.0-[02]--+-00.0 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
| \-00.1 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
+-07.0-[03]--
02:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
Subsystem: QUANTA Computer Inc Device 8975
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 256 bytes
Interrupt: pin A routed to IRQ 24
Region 0: Memory at def80000 (64-bit, prefetchable) [size=512K]
Region 2: I/O ports at cc00 [size=32]
Region 4: Memory at def7c000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
Address: 0000000000000000 Data: 0000
Masking: 00000000 Pending: 00000000
Capabilities: [70] MSI-X: Enable+ Count=64 Masked-
Vector table: BAR=4 offset=00000000
PBA: BAR=4 offset=00002000
Capabilities: [a0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ FLReset-
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
LnkCap: Port #0, Speed 5GT/s, Width x8, ASPM L0s, Latency L0 <1us, L1 <8us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-