On 1 Feb 2011, Bruce W. Allan spake thusly:
>>-----Original Message-----
>>From: Nix [mailto:n...@esperi.org.uk]
>>I am... confuzzled, but am happy to try turning L0s/L1 off (if I can
>>figure out how to do it: setpci is... not the most friendly of tools
>>and I've never even looked at its manpage before).
>
> ASPM is enabled/disabled via bits 1:0 of byte 16 in the Express Endpoint
> capability register. First see what is in this byte with the following:
>
> # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b
>
> where [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] is the slot information
> for your 82574. I'm guessing that command will return 43 (hex) to indicate
> ASPM L0s (bit 0) and ASPM L1 (bit 1) are both enabled based on your previous
Quite so.
More confusingly, they are both enabled on every kernel I have access
to, from 2.6.37 right back to 2.6.35.4 (which does not freeze with
in-tree nor out-of-tree drivers). Possibly something else is keeping it
active enough to stay awake in that kernel?
> lspci output. Now, re-write the byte with bits 1:0 set to 10b (or 42 hex)
> to disable ASPM L0s:
>
> # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b=42
>
> or 00b (40 hex) to disable both ASPM L0s and L1:
>
> # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b=40
>
> and verify with 'lspci -vvv' that ASPM L0s [and L1] are disabled.
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
So, lspci is not lying to us. (It looks to me like I can still get the
benefits of ASPM on the NIC that is only running at 100Mb/s: it's never
once frozen. So for now I've left it on on that NIC, and turned it off
on the gigabit one.)
Let us see if the NIC freezes in the next week or so.
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