[ofa-general] Write combining support in OFED 1.5

[Eli Cohen]

In PPC arch HPAGE_SHIFT is an unexported, variable (because huge page
sizes are different there). The huge pages patch needs to reference this
value (through HPAGE_SIZE).

-----Original Message-----
From: Jack Morgenstein [mailto:jackm at dev.mellanox.co.il] 
Sent: Tuesday, July 07, 2009 2:14 PM
To: Or Gerlitz; Eli Cohen
Cc: rdreier at cisco.com; general at lists.openfabrics.org
Subject: Re: [ofa-general] Write combining support in OFED 1.5

Adding Eli Cohen (author of the huge-page support patch).

Eli, what is missing on the PPC regarding huge page support?

-Jack

On Tuesday 07 July 2009 13:54, Or Gerlitz wrote:
> Jack Morgenstein wrote:
> > Yes, see kernel_patches/fixes/mlx4_0010_add_wc.patch. With OFED 1.5,
I am trying to use the kernel-based WC support, and eliminate the patch.
To do this, I need 2 things:
> > 1. macro pgprot_writecombine to be defined for PPC/PPC64 under the 
> > arch directory (file arch/powerpc/include/asm/pgtable.h)
> > 2. A way of determining (via the standard kernel) if write-combining
is available on a given platform (to allow disabling use of ConnectX
blueflame in userspace if WC is not available).
> >   
> It seems that none of the issues are IB specific, correct? As for PPC 
> guys I think we have another open issue with them, regarding huge 
> pages support, a patch which isn't mainline. Maybe you can use the 
> opportunity to set 
> http://lists.openfabrics.org/pipermail/general/2009-January/056812.htm
> l
> as well...
> 
> Or.
> 
> 
>