> > Some hardware devices now support PCIe 5.0, so change the default
> > speed of the PCIe root port on new machine types.
> >
> > For passthrough Nvidia H20, this will be able to increase the h2d/d2h
> > bandwidth ~17%.
>
>
> I'm curious. Why are you seeing the perf improvement?
>
>
> Maybe my mental model is wrong, but I though we just faked these
> registers so there should be no actual change of the link speed
> just a change in what the guest sees. Is the driver using this
> information to tune something else?
>
>
> I recently added support for the equivalent to CXL port emulation
> to support performance characteristic discovery but so far I think
> that's only informational for userspace software rather than affecting
> hardware usage directly.
Sorry, this email is forgotten to cc qemu-devel.
I'm also very curious about this. Maybe, as you mentioned,
the driver is using this information to make some settings?
But when I use ioh3420(it only support PCIe gen1) and pcie root port gen1, it
can alse get same bandwidth with gen4.
|---------------------------|------------|------------|
| root port | d2h(MB/s) | h2d(MB/s) |
|---------------------------|------------|------------|
| ioh3420 (gen1) | 45976.2 | 45681.9 |
|-----------------------------------------------------|
| pcie root port (gen1) | 45846.5 | 45993.7 |
|-----------------------------------------------------|
| pcie root port (gen4) | 45980.3 | 45915.4 |
|-----------------------------------------------------|
| pcie root port (gen5) | 53766.0 | 53682.0 |
|-----------------------------------------------------|
I would be glad if someone could explain it. Anyway, supporting Gen 5
won’t make things any worse.
Some information can get from VM as follow:
Origin pcie root port only support PCIe gen4
dmesg
[ 21.930515] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
[ 22.339006] pci 0000:61:00.0: reg 0x10: [mem 0x26002000000-0x26002ffffff
64bit pref]
[ 22.462006] pci 0000:61:00.0: reg 0x18: [mem 0x24000000000-0x25fffffffff
64bit pref]
[ 22.588005] pci 0000:61:00.0: reg 0x20: [mem 0x26000000000-0x26001ffffff
64bit pref]
[ 22.713135] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max
256)
[ 22.714223] pci 0000:61:00.0: Enabling HDA controller
[ 22.716635] pci 0000:61:00.0: 252.048 Gb/s available PCIe bandwidth,
limited by 16.0 GT/s PCIe x16 link at 0000:60:00.0 (capable of 504.112 Gb/s
with 32.0 GT/s PCIe x16 link)
PCIe capability
60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal
decode])
Capabilities: [54] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 16GT/s, Width x32, ASPM L0s, Exit
Latency L0s <64ns
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 16GT/s (ok), Width x16 (downgraded)
TrErr- Train- SlotClk- DLActive+ BWMgmt- ABWMgmt-
SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+
Surprise+
Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
SltCtl: Enable: AttnBtn+ PwrFlt- MRL- PresDet- CmdCplt+ HPIrq+
LinkChg-
Control: AttnInd Off, PwrInd On, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+
Interlock-
Changed: MRL- PresDet- LinkState-
RootCap: CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-
CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-
NROPrPrP- LTR-
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+
EETLPPrefix+, MaxEETLPPrefixes 4
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- LN System CLS Not Supported, TPHComp- ExtTPHComp-
ARIFwd+
AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled, ARIFwd-
AtomicOpsCtl: ReqEn- EgressBlck-
LnkCap2: Supported Link Speeds: 2.5-16GT/s, Crosslink- Retimer-
2Retimers- DRS-
LnkCtl2: Target Link Speed: 16GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-
EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3-
LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
Capabilities: [60] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns,
L1 <1us
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
SlotPowerLimit 75.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
MaxPayload 256 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency
L1 <4us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 32GT/s (ok), Width x16 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP-
LTR+
10BitTagComp+ 10BitTagReq+ OBFF Via message, ExtFmt-
EETLPPrefix-
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- TPHComp- ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled,
AtomicOpsCtl: ReqEn+
LnkCap2: Supported Link Speeds: 2.5-32GT/s, Crosslink- Retimer+
2Retimers+ DRS-
LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+
EqualizationPhase1+
EqualizationPhase2+ EqualizationPhase3+
LinkEqualizationRequest-
Retimer+ 2Retimers- CrosslinkRes: unsupported
pcie root port support PCIe gen1
dmesg
[ 21.419206] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
[ 21.827005] pci 0000:61:00.0: reg 0x10: [mem 0x5e002000000-0x5e002ffffff
64bit pref]
[ 21.952005] pci 0000:61:00.0: reg 0x18: [mem 0x5c000000000-0x5dfffffffff
64bit pref]
[ 22.074005] pci 0000:61:00.0: reg 0x20: [mem 0x5e000000000-0x5e001ffffff
64bit pref]
[ 22.196136] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max
256)
[ 22.197232] pci 0000:61:00.0: Enabling HDA controller
[ 22.199566] pci 0000:61:00.0: 2.000 Gb/s available PCIe bandwidth, limited
by 2.5 GT/s PCIe x1 link at 0000:60:00.0 (capable of 504.112 Gb/s with 32.0
GT/s PCIe x16 link)
PCIe capability
60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal
decode])
Capabilities: [54] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Exit
Latency L0s <64ns
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+
Surprise+
Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq-
LinkChg-
Control: AttnInd Off, PwrInd On, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet-
Interlock-
Changed: MRL- PresDet- LinkState-
RootCap: CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-
CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-
NROPrPrP- LTR-
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+
EETLPPrefix+, MaxEETLPPrefixes 4
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- LN System CLS Not Supported, TPHComp- ExtTPHComp-
ARIFwd+
AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled, ARIFwd-
AtomicOpsCtl: ReqEn- EgressBlck-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-
EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3-
LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
Capabilities: [60] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns,
L1 <1us
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
SlotPowerLimit 75.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
MaxPayload 256 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency
L1 <4us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 32GT/s (ok), Width x16 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP-
LTR+
10BitTagComp+ 10BitTagReq+ OBFF Via message, ExtFmt-
EETLPPrefix-
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- TPHComp- ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled,
AtomicOpsCtl: ReqEn+
LnkCap2: Supported Link Speeds: 2.5-32GT/s, Crosslink- Retimer+
2Retimers+ DRS-
LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+
EqualizationPhase1+
EqualizationPhase2+ EqualizationPhase3+
LinkEqualizationRequest-
Retimer+ 2Retimers- CrosslinkRes: unsupported
with this patch pcie root port support PCIe gen5
dmesg doesn't have this info.
PCIe capability
60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal
decode])
Capabilities: [54] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 32GT/s, Width x32, ASPM L0s, Exit Latency L0s
<64ns
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 32GT/s (ok), Width x16 (downgraded)
TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ Surprise+
Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
Control: AttnInd Off, PwrInd On, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock-
Changed: MRL- PresDet- LinkState-
RootCap: CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR-
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+
EETLPPrefix+, MaxEETLPPrefixes 4
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- LN System CLS Not Supported, TPHComp- ExtTPHComp- ARIFwd+
AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF
Disabled, ARIFwd-
AtomicOpsCtl: ReqEn- EgressBlck-
LnkCap2: Supported Link Speeds: 2.5-16GT/s, Crosslink- Retimer-
2Retimers- DRS-
LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-
EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3-
LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
Capabilities: [60] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit
75.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
MaxPayload 256 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency L1 <4us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 32GT/s (ok), Width x16 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- LTR+
10BitTagComp+ 10BitTagReq+ OBFF Via message, ExtFmt-
EETLPPrefix-
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- TPHComp- ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF
Disabled,
AtomicOpsCtl: ReqEn+
LnkCap2: Supported Link Speeds: 2.5-32GT/s, Crosslink- Retimer+
2Retimers+ DRS-
LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+
EqualizationPhase1+
EqualizationPhase2+ EqualizationPhase3+
LinkEqualizationRequest-
Retimer+ 2Retimers- CrosslinkRes: unsupported
use ioh3420 as root port:
dmesg
[ 19.922501] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
[ 20.325006] pci 0000:61:00.0: reg 0x10: [mem 0x26002000000-0x26002ffffff
64bit pref]
[ 20.443005] pci 0000:61:00.0: reg 0x18: [mem 0x24000000000-0x25fffffffff
64bit pref]
[ 20.557005] pci 0000:61:00.0: reg 0x20: [mem 0x26000000000-0x26001ffffff
64bit pref]
[ 20.671137] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max
256)
[ 20.672207] pci 0000:61:00.0: Enabling HDA controller
[ 20.674744] pci 0000:61:00.0: 2.000 Gb/s available PCIe bandwidth, limited
by 2.5 GT/s PCIe x1 link at 0000:60:00.0 (capable of 504.112 Gb/s with 32.0
GT/s PCIe x16 link)
PCIe capability
60:00.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express
Root Port 0 (rev 02) (prog-if 00 [Normal decode])
Capabilities: [90] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Exit
Latency L0s <64ns
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
TrErr- Train- SlotClk- DLActive+ BWMgmt- ABWMgmt-
SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+
Surprise+
Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
SltCtl: Enable: AttnBtn+ PwrFlt- MRL- PresDet- CmdCplt+ HPIrq+
LinkChg-
Control: AttnInd Off, PwrInd On, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+
Interlock-
Changed: MRL- PresDet- LinkState-
RootCap: CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-
CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-
NROPrPrP- LTR-
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+
EETLPPrefix+, MaxEETLPPrefixes 4
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- LN System CLS Not Supported, TPHComp- ExtTPHComp-
ARIFwd+
AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled, ARIFwd-
AtomicOpsCtl: ReqEn- EgressBlck-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-
EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3-
LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
Capabilities: [60] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns,
L1 <1us
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
SlotPowerLimit 75.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
MaxPayload 256 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency
L1 <4us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 32GT/s (ok), Width x16 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP-
LTR+
10BitTagComp+ 10BitTagReq+ OBFF Via message, ExtFmt-
EETLPPrefix-
EmergencyPowerReduction Not Supported,
EmergencyPowerReductionInit-
FRS- TPHComp- ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR-
OBFF Disabled,
AtomicOpsCtl: ReqEn+
LnkCap2: Supported Link Speeds: 2.5-32GT/s, Crosslink- Retimer+
2Retimers+ DRS-
LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+
EqualizationPhase1+
EqualizationPhase2+ EqualizationPhase3+
LinkEqualizationRequest-
Retimer+ 2Retimers- CrosslinkRes: unsupported
