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Hi,<BR>
<BR>
I'm interested in computing the overhead coming from PCI-Express to an IB HCA. Therefore I need to know the payload size of different types of HCA.<BR>
<BR>
We have InfiniHost III Mellanox cards of 4x SDR and DDR IB. According the lspci -vvv command on SLES 10 SP1, the PCI-e payload of these cards is maximum 128 bytes.<BR>
<BR>
Can someone give my the payload size for a ConnectX 4x SDR and DDR IB card? <BR>
<BR>
Thank you,<BR>
<BR>
Koen<BR>
<BR>
This is my output:<BR>
41:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex (rev a0)<BR>
Subsystem: Mellanox Technologies MT25208 InfiniHost III Ex<BR>
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-<BR>
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-<BR>
Latency: 0, Cache Line Size: 64 bytes<BR>
Interrupt: pin A routed to IRQ 209<BR>
Region 0: Memory at e1700000 (64-bit, non-prefetchable) [size=1M]<BR>
Region 2: Memory at e1800000 (64-bit, prefetchable) [size=8M]<BR>
Capabilities: [40] Power Management version 2<BR>
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)<BR>
Status: D0 PME-Enable- DSel=0 DScale=0 PME-<BR>
Capabilities: [48] Vital Product Data<BR>
Capabilities: [90] Message Signalled Interrupts: Mask- 64bit+ Queue=0/5 Enable-<BR>
Address: 0000000000000000 Data: 0000<BR>
Capabilities: [84] MSI-X: Enable+ Mask- TabSize=32<BR>
Vector table: BAR=0 offset=00082000<BR>
PBA: BAR=0 offset=00082200<BR>
Capabilities: [60] Express Endpoint IRQ 0<BR>
<B> Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag+</B><BR>
Device: Latency L0s <64ns, L1 unlimited<BR>
Device: AtnBtn- AtnInd- PwrInd-<BR>
Device: Errors: Correctable- Non-Fatal+ Fatal+ Unsupported-<BR>
Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-<BR>
Device: MaxPayload 128 bytes, MaxReadReq 4096 bytes<BR>
Link: Supported Speed 2.5Gb/s, Width x8, ASPM L0s, Port 8<BR>
Link: Latency L0s unlimited, L1 unlimited<BR>
Link: ASPM Disabled RCB 128 bytes CommClk- ExtSynch-<BR>
Link: Speed 2.5Gb/s, Width x8<BR>
<BR>
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