I read this thread lately and added the force option to my linux-3.9.2.
While most devices enabled ASPM, onboard Ethernet doesnt.
Board is an ASRock 760GM-GS3 and Ethernet chip seems to be RTL8111E.
According to google it looks like this chip isnt able to ASPM, also
LnkCap shows support, if I interpret LnkCap right.
Back to topic, my Radeon 5450 Evergreen got ASPM enabled.
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI
Manhattan [Mobility Radeon HD 5430 Series] (prog-if 00 [VGA controller])
LnkCap: Port #0, Speed 5GT/s, Width x16, ASPM L0s L1,
Latency L0 <64ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled-
Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
Kernel driver in use: radeon
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1,
Latency L0 <512ns, L1 <64us
ClockPM+ Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain-
CommClk+
Kernel driver in use: r8169
Am 21.05.2013 15:31, schrieb Phillip Susi:
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On 5/20/2013 4:01 PM, Rafael J. Wysocki wrote:
I'm pretty sure it's measurable, at least in some cases. Phoronix
did quite some fuss about a commit that caused ASPM to not work any
more on some systems some time ago, so he had to be able to measure
it (and it was called a "major power regression").
That is why I was trying to get it enabled, but the "major regression"
seems to be caused by Radeons using the ASPM as a cue to enter low
power mode. The energy saved by the bus itself going into the lower
power state I can't imagine is more than a few mW.
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