Re: [ugly patch] Save .15W-.5W by AHCI powersaving
Pavel Machek wrote: Hi! This is a patch (very ugly, assumes you have just one disk) to bring powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch as a base. It saves .5W compared to config with disk spinning, and even .15W compared to hdparm -y... on my thinkpad x60 anyway. .. There was a discussion of this here today. Real-life discussion, or something I could read? :-). It makes good use of AHCI-specific features. Has it been tested with a Port-Multiplier yet? I do not know what port-multiplier is, sorry. But it was not really tested. It is not expected to work on any other config than notebook very similar to mine. This is cool enough that we really ought to do a hardware-independent version, so that all SATA interfaces could benefit. Especially ata_piix, but others too. Well, it seems like it is 10 lines per driver once Alan's SCSI autosuspend patches are in... .. Cool (literally)! I think I might have gotten your patch confused in my mind with another AHCI patch, which uses features of the chip itself to automatically negotiate/change link power status on the fly (no s/w needed, other than to turn it on). That one is very ACPI specific, though. - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ugly patch] Save .15W-.5W by AHCI powersaving
On Mon, Feb 25, 2008 at 05:42:58PM -0500, Jeff Garzik wrote: BTW we can also save power by allowing the user to choose to disable hotplugging support. Then we can power down PHYs that are not in use. That requires the addition of some policy controls, because it is user-specific whether or not to waste power waiting for a plug-in event. For AHCI, if you've enabled link power management then you've already disabled hotplug. We might as well power down unused phys in that case. Note that laptop bays still seem to tend to use platform-specific hotplug notification, even when they're sata - we'll get the hotplug notify for them even if the phy's powered down, so that case also needs to be handled. -- Matthew Garrett | [EMAIL PROTECTED] - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ugly patch] Save .15W-.5W by AHCI powersaving
Pavel Machek wrote: Hi! This is a patch (very ugly, assumes you have just one disk) to bring powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch as a base. It saves .5W compared to config with disk spinning, and even .15W compared to hdparm -y... on my thinkpad x60 anyway. .. There was a discussion of this here today. It makes good use of AHCI-specific features. Has it been tested with a Port-Multiplier yet? This is cool enough that we really ought to do a hardware-independent version, so that all SATA interfaces could benefit. Especially ata_piix, but others too. Cheers - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ugly patch] Save .15W-.5W by AHCI powersaving
Hi! This is a patch (very ugly, assumes you have just one disk) to bring powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch as a base. It saves .5W compared to config with disk spinning, and even .15W compared to hdparm -y... on my thinkpad x60 anyway. .. There was a discussion of this here today. Real-life discussion, or something I could read? :-). It makes good use of AHCI-specific features. Has it been tested with a Port-Multiplier yet? I do not know what port-multiplier is, sorry. But it was not really tested. It is not expected to work on any other config than notebook very similar to mine. This is cool enough that we really ought to do a hardware-independent version, so that all SATA interfaces could benefit. Especially ata_piix, but others too. Well, it seems like it is 10 lines per driver once Alan's SCSI autosuspend patches are in... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ugly patch] Save .15W-.5W by AHCI powersaving
Mark Lord wrote: Pavel Machek wrote: This is a patch (very ugly, assumes you have just one disk) to bring powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch as a base. It saves .5W compared to config with disk spinning, and even .15W compared to hdparm -y... on my thinkpad x60 anyway. .. There was a discussion of this here today. It makes good use of AHCI-specific features. Has it been tested with a Port-Multiplier yet? This is cool enough that we really ought to do a hardware-independent version, so that all SATA interfaces could benefit. Especially ata_piix, but others too. BTW we can also save power by allowing the user to choose to disable hotplugging support. Then we can power down PHYs that are not in use. That requires the addition of some policy controls, because it is user-specific whether or not to waste power waiting for a plug-in event. Jeff - To unsubscribe from this list: send the line unsubscribe linux-ide in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
