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SubjectRe: SATA RAID5 speed drop of 100 MB/s
Carlo Wood wrote:
> For what it's worth... I tried applying
>
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -516,6 +516,8 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
> * reset. Values without are used for driver operation.
> */
> hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
> + hpriv->saved_cap &= ( (1<<28) | (1<<17) );
> + hpriv->saved_cap |= (1 << 27);
> hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);

Hmmm... That's super-odd. You win my oddest-of-the-month award. :-)

I'll think about it a bit. Please stand by.

--
tejun
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