[ofa-general] PCI-Express payload

[Koen Segers]

Hi,

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.

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.

Can someone give my the payload size for a ConnectX 4x SDR and DDR IB
card? 

Thank you,

Koen

This is my output:
41:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex (rev
a0)
        Subsystem: Mellanox Technologies MT25208 InfiniHost III Ex
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr+ Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 209
        Region 0: Memory at e1700000 (64-bit, non-prefetchable)
[size=1M]
        Region 2: Memory at e1800000 (64-bit, prefetchable) [size=8M]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [48] Vital Product Data
        Capabilities: [90] Message Signalled Interrupts: Mask- 64bit+
Queue=0/5 Enable-
                Address: 0000000000000000  Data: 0000
        Capabilities: [84] MSI-X: Enable+ Mask- TabSize=32
                Vector table: BAR=0 offset=00082000
                PBA: BAR=0 offset=00082200
        Capabilities: [60] Express Endpoint IRQ 0
                Device: Supported: MaxPayload 128 bytes, PhantFunc 0,
ExtTag+
                Device: Latency L0s <64ns, L1 unlimited
                Device: AtnBtn- AtnInd- PwrInd-
                Device: Errors: Correctable- Non-Fatal+ Fatal+
Unsupported-
                Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                Device: MaxPayload 128 bytes, MaxReadReq 4096 bytes
                Link: Supported Speed 2.5Gb/s, Width x8, ASPM L0s, Port
8
                Link: Latency L0s unlimited, L1 unlimited
                Link: ASPM Disabled RCB 128 bytes CommClk- ExtSynch-
                Link: Speed 2.5Gb/s, Width x8

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