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Date: Mon, 16 Nov 2009 22:19:34 -0500 From: Jeff Garzik <jeff@...zik.org> To: Shaohua Li <shaohua.li@...el.com> CC: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, jgarzik@...hat.com, sean.hefty@...el.com, Arjan van de Ven <arjan@...ux.intel.com>, Alan Cox <alan@...ux.intel.com> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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