On 05/07/2010 01:14 AM, Tejun Heo wrote:
Hello,
On 05/06/2010 09:49 PM, Jeff Garzik wrote:
The problem being... that we are honoring SSS bit, and thus thing are
slower? :) I don't see any reason to change that, seeing as how people
may be using it to avoid power spikes.
I agree there's no way to tell whether SSS is needed, but we cannot
ignore SSS on that basis alone. We should avoid making the assumption
that BIOS w/ SSS bit has already spun up all drives regardless.
It's just that the usefulness seems very limited at this point so it
might be better idea to flip the default behavior and let people opt
in for SSS. The problem is compounded by the complete serial behavior
we end up with and on some machines large number of ahci ports. I
don't care much about boot time all that much but as that seems to be
a hot issue on desktops too these days.
I'm not sure the usefulness is limited, as it definitely avoids power
spikes on server BIOSen that care.
Also, it seems unwise for the Linux SATA driver to do the exact
-opposite- of what the SSS bit intends, by default.
The existing ignore_sss option should be sufficient for people who wish
to entertain non-standard behavior...
Jeff
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