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Message-ID: <4DA68FBB.4030807@zytor.com> Date: Wed, 13 Apr 2011 23:10:03 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Dave Airlie <airlied@...hat.com> CC: Yinghai Lu <yinghai@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, dri-devel@...ts.freedesktop.org, Tejun Heo <tj@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: Linux 2.6.39-rc3 On 04/13/2011 07:07 PM, Dave Airlie wrote: >> >> Okay, staring at this, it definitely seems toxic to overlay the GART >> over memory areas reserved by the BIOS. If I were to guess, I would say >> that the problem here seems to be that the kernel thinks it is >> overlaying 64 MiB of memory, but the actual GART is in fact 512 MiB in >> size -- 131072 CPU pages -- which now overlaps the BIOS reserved areas. >> >> Alex D., could you comment on the "num cpu pages" bit? > > These are not CPU addresses. I think we've stated that already. Not the > droids. > > the num cpu pages is how many CPU pages would be needed to fill the GPU > GTT, for those crazy cases where CPU pagesize != GPU pagesize. > OK, well, something is still weird. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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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