** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux via
http://bugzilla.kernel.org/show_bug.cgi?id=85621
Importance: Unknown
Status: Unknown
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1377596
Title:
pcie_aspm.policy=powersave pcie_aspm=force does not enable L0sL1 (L0s
L1) on each ASPM PCIe device
Status in The Linux Kernel:
Unknown
Status in “linux” package in Ubuntu:
Triaged
Bug description:
4) What happened instead
===============================================
# dmesg | grep -e _OSC -e ASPM
[ 0.000000] PCIe ASPM is forcibly enabled
[ 0.085767] ACPI FADT declares the system doesn't support PCIe ASPM, so
disable it
[ 0.116506] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM
ClockPM Segments MSI]
[ 0.116664] acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug
PME]
[ 0.116764] acpi PNP0A08:00: _OSC: OS now controls [AER PCIeCapability]
[ 0.125997] acpi PNP0A08:00: Disabling ASPM (FADT indicates it is
unsupported)
# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.17.0-999-generic root=/dev/sda1 ro biosdevname=0
intel_pstate=enable ipv6.disabled=1 debug ignore_loglevel panic=10
pcie_aspm.policy=powersave pcie_aspm=force r8168.aspm=1 r8168.eee_enable=1
oops=panic
# lspci -vvvv | grep ASPM
LnkCap: Port #2, Speed 5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s
<1us, L1 <8us
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
<1us, L1 <4us
LnkCtl: ASPM L0s Enabled; RCB 64 bytes Disabled- CommClk-
LnkCap: Port #6, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
<512ns, L1 <16us
LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
unlimited, L1 <64us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
3) What you expected to happen
===============================================
# lspci -vvvv | grep ASPM
LnkCap: Port #2, Speed 5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s
<1us, L1 <8us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk-
LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
<1us, L1 <4us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk-
LnkCap: Port #6, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
<512ns, L1 <16us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s
unlimited, L1 <64us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
Corresponding PCIe devices:
# lspci -s 00:01.00 -nn
00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v3/4th Gen Core
Processor PCI Express x16 Controller [8086:0c01] (rev 06)
# lspci -s 00:1c.00 -nn
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset
Family PCI Express Root Port #1 [8086:8c10] (rev d5)
# lspci -s 00:1c.05 -nn
00:1c.5 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset
Family PCI Express Root Port #6 [8086:8c1a] (rev d5)
# lspci -s 03:00.00 -nn
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 11)
Current workaround:
ASPM L0s L1 Enabled on each PCIe device can be created using manually using
the correct setpci commands. This reliably enables ASPM L0s and L1 saving 25%
in power consumption when measured at wall over at least 8 hours:
# setpci -s 00:01.00 0xB0.B=0x3 # Intel Xeon E3-1200 PCIe controller
[8086:0c01]
# setpci -s 00:1c.05 0x50.B=0x43 # Intel 8 series PCIe root port #6
[8086:8c1a]
# setpci -s 00:1c.00 0x50.B=0x43 # Intel 8 series PCIe root port #1
[8086:8c10]
# setpci -s 03:00.00 0x80.B=0x43 # Realtek Gigabit Ethernet [10ec:8168]
2) The version of the package you are using
===============================================
# uname -a
Linux ubuntu14 3.17.0-999-generic #201409282205 SMP Mon Sep 29 02:06:39 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux
1) The release of Ubuntu
===============================================
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Version signature is missing due to:
# cat /proc/version_signature
cat: /proc/version_signature: No such file or directory
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