Messages in this thread | | | Date | Mon, 16 Nov 2009 22:19:34 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH]AHCI: disable sntf cap for ich8 |
| |
On 11/15/2009 08:56 PM, Shaohua Li wrote: > I obseved there is a sata_async_notification() for every ahci interrupt. But the > async notification does nothing (this is hard disk drive and no pmp). This cause > cpu wastes some time on sntf register access. > > It appears ICH AHCI doesn't support SNotification register, but the controller > reports it does. After quirking it, the async notification disappears.
Patch applied.
> PS. it appears all ICH don't support SNotification register from ICH manual, don't > know if we need quirk all ICH. I don't have machines with all kinds of ICH.
You work for Intel -- you or somebody needs to research and figure this out... This is an Intel vendor issue that only Intel can definitively resolve.
Jeff
| |