[PATCH] PCI: keystone: add a pci quirk to limit mrrs

Jason Gunthorpe jgunthorpe at obsidianresearch.com
Wed Aug 6 10:30:14 PDT 2014

On Wed, Aug 06, 2014 at 01:09:41PM -0400, Murali Karicheri wrote:

> >>Yes it works with tuning enabled. Tuning happens afterwards. The
> >>'limiting mrrs to 256' below is from my patch.
> >
> >That seems backwards to me...
> Rational? The tuning is reading mrrs and set mps to less than or
> equal to mrss. So adding this before make sure mrrs used is below
> keystones's limit.

The tuning process adjusts the parameters however it sees fit, todays
algorithm might not increase a BIOS set MRRS, but tomorrow's could.

The quirk should be after the tuning to ensure the MRRS is limited..


More information about the linux-arm-kernel mailing list