video drivers, agp, mtrr, and write-combining

I have a silly question.

I've noticed that some, though no all, video drivers add their video memory
to MTRR as 'write-combining' if both MTRR and AGP are configured in.

Is there a reason that all video drivers don't do this?  Is it all would 
benefit from write-combining memory, but that some simply haven't been 
updated to take advantage of it?  Or could write-combining actually be 
detrimental to some video drivers?  (And if the former, would it make
more sense to do the mtrr_add in a central location, say agpgart?)

Ali
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: video drivers, agp, mtrr, and write-combining
    • From: Dave Jones <[email protected]>

• Prev by Date: Re: [RFC][PATCH] nameing reserved pages [1/3]
• Next by Date: Re: writev to scsi disks
• Previous by thread: Re: [PATCH] hfsplus: add an option to force r/w mount
• Next by thread: Re: video drivers, agp, mtrr, and write-combining
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]