Messages in this thread | | | Date | Mon, 26 Nov 2001 18:21:03 -0600 (CST) | From | Oliver Xymoron <> | Subject | Re: ext3: kjournald and spun-down disks |
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On Tue, 27 Nov 2001, Daniel Kobras wrote:
> On Fri, Nov 23, 2001 at 05:25:46PM -0800, Andrew Morton wrote: > > Also, if we had appropriate hooks into the request layer, we could detect > > when the disk was being spun up for a read, and opporunistically flush > > out any pending writes. > > Actually you can't. SCSI spinup code isn't very useful anyway, and IDE disks > mostly handle spinup themselves. The kernel has too issue a reset to get a > disk back alive from sleep mode, but revival from standby doesn't involve > the kernel at all. When using the disk's internal timer, it isn't involved in > spindown either. Teaching the request layer about disk state might therefore > turn out to become rather messy, I suspect.
Depends on how far you want to take it. The kernel can of course query to discover whether a device is on standby and delay writes if possible before actually initiating a flush.
-- "Love the dolphins," she advised him. "Write by W.A.S.T.E.."
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