On 01/16/2012 02:55 PM, Linus Torvalds wrote:
so old kernels used to be a tiny bit faster despite not doing that async thing (still slower than I'd like: I'd think that we should be able to resume devices in less than a second, but I don't know where all the time goes)
In libata specifically, we remain peppered liberally with a bunch of msleep()'s all over the place, particularly when dealing with SATA phys. 10ms here, 20ms there, 200ms in sata_link_resume(), it all adds up when you're talking about fast boot.
For most hardware, we can scan ports in parallel, which gets you past the biggest annoyances, but not all of them.
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