Re: [git patch] libata resume fix

[Tejun Heo]

Jens Axboe wrote:
> > Can you measure spin up time for your 15k's?  Some controllers can't 
> > catch the first D2H FIS after POR and have to wait unconditionally for 
> > spin up for hotplug & resuming from suspend.  Currently 8 sec wait is 
> > used but it seems insufficient for your drives.  Failing to spinup in 
> > that 8 secs would probably result in timeout of the first reset attempt 
> > and retrial - which currently takes > 30 secs.
> >
> > Spin-up time can be measured by first issuing STANDBY and then time how 
> > long IDLE IMMEDIATE takes, I think.
>
> The 15K RPM is a SCSI drive, I haven't seen any SATA 15K rpm drives yet.
> I have the same model in another box, I can measure spinup with
> START_STOP unit there. I will do so later today, when I fire it up, if
> you still want to know?

Arggh.. Confused w/ 10k drives.  But it would be nice to know spin-up 
time for 15k's if it doesn't waste too much of your time.

Thanks.

--
tejun
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