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Date: Thu, 27 Aug 2009 03:13:32 +0200 From: Volker Armin Hemmann <volkerarmin@...glemail.com> To: Yinghai Lu <yhlu.kernel@...il.com>, linux-kernel@...r.kernel.org Subject: Re: amd64 + mtrr: only 3.1gb of 8gb are covered, kernel 2.6.30 and earlier. Hi, On Sonntag 23 August 2009, Yinghai Lu wrote: > On Sat, Aug 22, 2009 at 12:26 PM, Volker Armin > > Hemmann<volkerarmin@...glemail.com> wrote: > > when I went from 4gb to 6gb I had a performance degradation. Since the > > 8gb are faster and the new cpu is faster, I don't see degradation. But I > > wonder how much better performance could be with 'correct' mtrr. > > that is weird. with 4g should have mem hole remapping. > > do you still have /proc/mtrr for 6g setup? > > YH some more information, mtrr of 8gb with my X2 6000: reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back reg02: base=0x0c0000000 ( 3072MB), size= 128MB, count=1: write-back reg03: base=0x0c8000000 ( 3200MB), size= 64MB, count=1: write-back reg04: base=0x0cc000000 ( 3264MB), size= 32MB, count=1: write-back reg05: base=0x0ce000000 ( 3296MB), size= 16MB, count=1: write-back from June with 2.6.30, dmesg from that incident is attached compared that with the mtrr with my X4: reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back reg02: base=0x0c0000000 ( 3072MB), size= 128MB, count=1: write-back just ignore the fgrlx parts - whenever I checked it did not made a difference if X was started or not. View attachment "dmesg_8gb_x2_6000" of type "text/plain" (64742 bytes) View attachment "dmesg_8gb_x4_955" of type "text/plain" (45621 bytes)
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