How to check how many lanes are used by the PCIe card?
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PCI Express slots on the motherboard can be wider then the number of lanes connected.
For example a motherboard can have x8 slot with only x1 lane connected.
On the other hand, you can insert a card using only for ex. 4 lanes to a x16 slot on the motherboard, and they will negotiate to use only those x4 lanes.
How to check from the running system how many lanes are used by the inserted PCIe cards?
pci
asked Aug 12 '10 at 11:52
silksilk
6122812
add a comment |
PCI Express slots on the motherboard can be wider then the number of lanes connected.
For example a motherboard can have x8 slot with only x1 lane connected.
On the other hand, you can insert a card using only for ex. 4 lanes to a x16 slot on the motherboard, and they will negotiate to use only those x4 lanes.
How to check from the running system how many lanes are used by the inserted PCIe cards?
pci
asked Aug 12 '10 at 11:52
silksilk
6122812
add a comment |
PCI Express slots on the motherboard can be wider then the number of lanes connected.
For example a motherboard can have x8 slot with only x1 lane connected.
On the other hand, you can insert a card using only for ex. 4 lanes to a x16 slot on the motherboard, and they will negotiate to use only those x4 lanes.
How to check from the running system how many lanes are used by the inserted PCIe cards?
pci
asked Aug 12 '10 at 11:52
silksilk
6122812
PCI Express slots on the motherboard can be wider then the number of lanes connected.
For example a motherboard can have x8 slot with only x1 lane connected.
On the other hand, you can insert a card using only for ex. 4 lanes to a x16 slot on the motherboard, and they will negotiate to use only those x4 lanes.
How to check from the running system how many lanes are used by the inserted PCIe cards?
pci
pci
asked Aug 12 '10 at 11:52
silksilk
6122812
asked Aug 12 '10 at 11:52
silksilk
6122812
asked Aug 12 '10 at 11:52
silksilk
6122812
asked Aug 12 '10 at 11:52
silksilk
6122812
asked Aug 12 '10 at 11:52
silksilk
6122812
6122812
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Ok, it seems I missed it on first try in lspci manpages.
Note: Run the command as root/sudo otherwise a lot of detail is ommitted including the Lnk output shown below.
lspci -vv displays a lot of information, including link width:
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 8800 GT] (rev a2) (prog-if 00 [VGA controller])
[...]
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
edited Jul 18 '12 at 8:38
Tim Sutton
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
1
in your example the output text has bothwidth x16andwidth x8. I assume this is interpretted as:the link capacity is width x16andthis device has negotiated width x8?
– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
add a comment |
Sometimes it can be a bit more complicated.
For example, 4 Port GBit ethernet adapters have a PCIe switch on board. I trapped into an issue where I found the Ethernet Adapter connected to x4, but a bottleneck upstream when the onboard pcie switch was connected at x1 to the motherboard only.
See this thread for the issue: http://thread.gmane.org/gmane.linux.drivers.e1000.devel/15192/focus=15254
To get a grasp on tree connectivity, compare the view of
sudo lspci -tv
sudo lspci -vv | grep -P "[0-9a-f]2:[0-9a-f]2.[0-9a-f]|LnkSta:"
The last line will show you the Link Status below every device on the bus without the overwelming detail of vv option.
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
add a comment |
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2 Answers
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2 Answers
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Ok, it seems I missed it on first try in lspci manpages.
Note: Run the command as root/sudo otherwise a lot of detail is ommitted including the Lnk output shown below.
lspci -vv displays a lot of information, including link width:
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 8800 GT] (rev a2) (prog-if 00 [VGA controller])
[...]
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
edited Jul 18 '12 at 8:38
Tim Sutton
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
1
in your example the output text has bothwidth x16andwidth x8. I assume this is interpretted as:the link capacity is width x16andthis device has negotiated width x8?
– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
add a comment |
Ok, it seems I missed it on first try in lspci manpages.
Note: Run the command as root/sudo otherwise a lot of detail is ommitted including the Lnk output shown below.
lspci -vv displays a lot of information, including link width:
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 8800 GT] (rev a2) (prog-if 00 [VGA controller])
[...]
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
edited Jul 18 '12 at 8:38
Tim Sutton
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
1
in your example the output text has bothwidth x16andwidth x8. I assume this is interpretted as:the link capacity is width x16andthis device has negotiated width x8?
– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
add a comment |
Ok, it seems I missed it on first try in lspci manpages.
Note: Run the command as root/sudo otherwise a lot of detail is ommitted including the Lnk output shown below.
lspci -vv displays a lot of information, including link width:
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 8800 GT] (rev a2) (prog-if 00 [VGA controller])
[...]
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
edited Jul 18 '12 at 8:38
Tim Sutton
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
Ok, it seems I missed it on first try in lspci manpages.
Note: Run the command as root/sudo otherwise a lot of detail is ommitted including the Lnk output shown below.
lspci -vv displays a lot of information, including link width:
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 8800 GT] (rev a2) (prog-if 00 [VGA controller])
[...]
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
edited Jul 18 '12 at 8:38
Tim Sutton
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
edited Jul 18 '12 at 8:38
Tim Sutton
1032
edited Jul 18 '12 at 8:38
Tim Sutton
1032
edited Jul 18 '12 at 8:38
Tim Sutton
1032
1032
answered Aug 12 '10 at 12:15
silksilk
6122812
answered Aug 12 '10 at 12:15
silksilk
6122812
answered Aug 12 '10 at 12:15
silksilk
6122812
6122812
1
in your example the output text has bothwidth x16andwidth x8. I assume this is interpretted as:the link capacity is width x16andthis device has negotiated width x8?
– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
add a comment |
1
in your example the output text has bothwidth x16andwidth x8. I assume this is interpretted as:the link capacity is width x16andthis device has negotiated width x8?
– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
1
1
in your example the output text has both
width x16 and width x8. I assume this is interpretted as: the link capacity is width x16 and this device has negotiated width x8?– Trevor Boyd Smith
Nov 21 '14 at 18:26
in your example the output text has both
width x16 and width x8. I assume this is interpretted as: the link capacity is width x16 and this device has negotiated width x8?– Trevor Boyd Smith
Nov 21 '14 at 18:26
1
1
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Yes, that's how I understand it, too.
– silk
Nov 24 '14 at 10:47
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
Same as @ʇsәɹoɈ 's comment at other answer; Use root/sudo
– hbogert
Oct 7 '18 at 13:38
add a comment |
Sometimes it can be a bit more complicated.
For example, 4 Port GBit ethernet adapters have a PCIe switch on board. I trapped into an issue where I found the Ethernet Adapter connected to x4, but a bottleneck upstream when the onboard pcie switch was connected at x1 to the motherboard only.
See this thread for the issue: http://thread.gmane.org/gmane.linux.drivers.e1000.devel/15192/focus=15254
To get a grasp on tree connectivity, compare the view of
sudo lspci -tv
sudo lspci -vv | grep -P "[0-9a-f]2:[0-9a-f]2.[0-9a-f]|LnkSta:"
The last line will show you the Link Status below every device on the bus without the overwelming detail of vv option.
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
add a comment |
Sometimes it can be a bit more complicated.
For example, 4 Port GBit ethernet adapters have a PCIe switch on board. I trapped into an issue where I found the Ethernet Adapter connected to x4, but a bottleneck upstream when the onboard pcie switch was connected at x1 to the motherboard only.
See this thread for the issue: http://thread.gmane.org/gmane.linux.drivers.e1000.devel/15192/focus=15254
To get a grasp on tree connectivity, compare the view of
sudo lspci -tv
sudo lspci -vv | grep -P "[0-9a-f]2:[0-9a-f]2.[0-9a-f]|LnkSta:"
The last line will show you the Link Status below every device on the bus without the overwelming detail of vv option.
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
add a comment |
Sometimes it can be a bit more complicated.
For example, 4 Port GBit ethernet adapters have a PCIe switch on board. I trapped into an issue where I found the Ethernet Adapter connected to x4, but a bottleneck upstream when the onboard pcie switch was connected at x1 to the motherboard only.
See this thread for the issue: http://thread.gmane.org/gmane.linux.drivers.e1000.devel/15192/focus=15254
To get a grasp on tree connectivity, compare the view of
sudo lspci -tv
sudo lspci -vv | grep -P "[0-9a-f]2:[0-9a-f]2.[0-9a-f]|LnkSta:"
The last line will show you the Link Status below every device on the bus without the overwelming detail of vv option.
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
Sometimes it can be a bit more complicated.
For example, 4 Port GBit ethernet adapters have a PCIe switch on board. I trapped into an issue where I found the Ethernet Adapter connected to x4, but a bottleneck upstream when the onboard pcie switch was connected at x1 to the motherboard only.
See this thread for the issue: http://thread.gmane.org/gmane.linux.drivers.e1000.devel/15192/focus=15254
To get a grasp on tree connectivity, compare the view of
sudo lspci -tv
sudo lspci -vv | grep -P "[0-9a-f]2:[0-9a-f]2.[0-9a-f]|LnkSta:"
The last line will show you the Link Status below every device on the bus without the overwelming detail of vv option.
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
edited Dec 31 '18 at 2:00
Scott Stensland
4711413
4711413
answered Mar 30 '15 at 9:48
wjrwjr
8113
answered Mar 30 '15 at 9:48
wjrwjr
8113
answered Mar 30 '15 at 9:48
wjrwjr
8113
8113
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
add a comment |
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
10
10
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
Note: When run as an unprivileged user, lspci doesn't show the LnkCap / LnkSta / Width stats. Run it with sudo to see them.
– ʇsәɹoɈ
Jan 7 '17 at 18:44
add a comment |
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