Messages in this thread | | | Date | Wed, 08 Aug 2007 13:04:50 -0400 | From | Mark Lord <> | Subject | Re: Disk spin down issue on shut down/suspend to disk |
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Tejun Heo wrote: > Mark Lord wrote: >> Further to this, if I have an active-writer running at the time of suspend, >> then even my scripted "sleep 1" is not good enough, as additional writes >> are still happening before/after the flush. >> >> Now I'll reboot and try it with the "sleep 1" hardcoded inside >> sd_suspend(). > > Hmmm... queue quiescing might be broken. Can you verify there's no > command issued between STANDBYNOW1 and suspending?
Yeah, I verified that already. Nothing happens other than the FLUSH_CACHE_EXT and STANDBY commands.
I've now tried adding various sleeps into the sd_suspend() routine. The sleeps actually do sleep, but they don't seem to solve the problem there. The "hdparm -F /dev/sda ; sleep 1" inside my script actually works better, though even it fails if there's a ton of writes happening.
I put a 4-second sleep in front of the sd_start_stop_device() call, and here is what I observed:
the disk light flickers briefly, then the system does absolutely nothing for the 4-seconds, and then it flickers again, and then the light comes on solid for a second or two, and then it suspends.
I am ssssoooooooo confused now. :)
We need Eric (from Seagate) to enlighten us.
Cheers
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