On Thu, Aug 1, 2013 at 8:13 PM, Pavel Machek <[email protected]> wrote:

> Hmm. So I've update bios using 7buj28uc.iso . Reverted the patches and
> yes, ping latencies are still bad:

Wow.  I can hardly believe how bad this is (assuming Windows has the
same problem).  Thanks a lot for checking this out.

>> >> Carolyn's patch will likely work, at least most of the time, but I
>> >> think there's a small possibility that it could cause a conflict
>> >> between the BIOS and the OS over ASPM control, so I'm not 100% in
>> >> support of that approach.  A conflict may not happen on your
>> >> machine,
>> >
>> > Can we base it on DMI  whitelist?
>>
>> I don't think we can know a priori whether a machine (even your
>> machine) is susceptible to a conflict.  But if Carolyn forcibly
>
> We don't apriori now how broken machines are, true. There are 1000
> ways BIOS can break things. And yes, it will be us breaking the specs
> here. But "useful machine with OS breaking specs" is better than
> "machine useless for ssh".
>
> _If_ there's a conflict, we can try something else.
>
> (Has someone really seen a conflict, or is it just theoretical thing?)

Completely theoretical, as far as I know.  I don't even know what a
conflict would look like.  Maybe some unexpected ASPM enable/disable
from SMM during suspend/resume or something.  Things like that would
likely go unnoticed anyway.

Bjorn

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