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Message-ID: <86802c440804300926s42d0da4fs34a9a95d6d466cbe@mail.gmail.com> Date: Wed, 30 Apr 2008 09:26:19 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "Gabriel C" <nix.or.die@...glemail.com> Cc: "Andrew Morton" <akpm@...ux-foundation.org>, "Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, "Thomas Gleixner" <tglx@...utronix.de>, "Mika Fischer" <mika.fischer@...pnet.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7 On Wed, Apr 30, 2008 at 5:04 AM, Gabriel C <nix.or.die@...glemail.com> wrote: > > Yinghai Lu wrote: > > On Tue, Apr 29, 2008 at 9:12 PM, Gabriel C <nix.or.die@...glemail.com> wrote: > >> Yinghai Lu wrote: > >> > please try the patches > >> > > >> > from > >> > http://lkml.org/lkml/2008/4/29/754 > >> > http://lkml.org/lkml/2008/4/29/753 > >> > > >> > in addtion to > >> > > >> > http://people.redhat.com/mingo/x86.git/README > >> > ( it has v8 already) > >> > > >> > and try with mtrr_gran_size=128m > >> > >> Without any value I get : > >> > >> ... > >> > >> [ 0.000000] Linux version 2.6.25-x86-latest.git-06598-g6a2c2ff-dirty (crazy@...r) (gcc version 4.3.0 (Frugalware Linux) ) #1 SMP PREEMPT Wed Apr 30 05:51:39 CEST 2008 > >> > >> > >> [ 0.000000] Command line: root=/dev/sdb1 ro debug vga=0x317 > >> [ 0.000000] BIOS-provided physical RAM map: > >> [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009cc00 (usable) > >> [ 0.000000] BIOS-e820: 000000000009cc00 - 00000000000a0000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved) > >> [ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf550000 (usable) > >> [ 0.000000] BIOS-e820: 00000000cf550000 - 00000000cf55e000 (ACPI data) > >> [ 0.000000] BIOS-e820: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS) > >> [ 0.000000] BIOS-e820: 00000000cf5e0000 - 00000000cf600000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved) > >> [ 0.000000] BIOS-e820: 0000000100000000 - 000000012c000000 (usable) > >> [ 0.000000] Entering add_active_range(0, 0, 156) 0 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 256, 849232) 1 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 1048576, 1228800) 2 entries of 256 used > >> [ 0.000000] max_pfn_mapped = 1228800 > >> [ 0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106 > >> [ 0.000000] After WB checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 000000000012c000 > >> [ 0.000000] After UC checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000 > >> [ 0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000 > >> [ 0.000000] After sorting > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> [ 0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000 > >> [ 0.000000] range0: 0000000000000000 - 00000000c0000000 > >> [ 0.000000] Setting variable MTRR 0, base: 0MB, range: 2048MB, type WB > >> [ 0.000000] Setting variable MTRR 1, base: 2048MB, range: 1024MB, type WB > >> [ 0.000000] range: 00000000c0000000 - 00000000cf600000 > >> > >> [ 0.000000] Setting variable MTRR 2, base: 3072MB, range: 128MB, type WB > >> [ 0.000000] Setting variable MTRR 3, base: 3200MB, range: 64MB, type WB > >> [ 0.000000] Setting variable MTRR 4, base: 3264MB, range: 32MB, type WB > >> [ 0.000000] Setting variable MTRR 5, base: 3296MB, range: 16MB, type WB > >> [ 0.000000] Setting variable MTRR 6, base: 3312MB, range: 4MB, type WB > >> [ 0.000000] Setting variable MTRR 7, base: 3316MB, range: 2MB, type WB > >> [ 0.000000] range0: 00000000cf800000 - 00000000df800000 > >> [ 0.000000] range: 00000000df800000 - 00000000d0000000 > >> > >> [ 0.000000] DONE variable MTRRs > >> [ 0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new 0x7010600070106 > >> [ 0.000000] After WB checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> > >> [ 0.000000] After UC checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> > >> [ 0.000000] After sorting > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 704MB of RAM. > >> > >> [ 0.000000] update e820 for mtrr > >> > >> [ 0.000000] modified physical RAM map: > >> [ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable) > >> [ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved) > >> [ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved) > >> [ 0.000000] modified: 0000000000100000 - 00000000cf550000 (usable) > >> [ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data) > >> [ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS) > >> [ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved) > >> [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved) > >> > >> [ 0.000000] modified: 00000000ffc00000 - 000000012c000000 (reserved) > >> [ 0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 256, 849232) 3 entries of 256 used > >> > >> [ 0.000000] max_pfn_mapped = 1228800 > >> [ 0.000000] init_memory_mapping > >> > >> ... > >> > >> [ 20.984343] [drm] Initialized i915 1.6.0 20060119 on minor 0 > >> [ 21.450368] mtrr: no more MTRRs available > >> > >> ... > >> > >> with mtrr_gran_size=128m I get : > >> > >> ... > >> > >> [ 0.000000] Linux version 2.6.25-x86-latest.git-06598-g6a2c2ff-dirty (crazy@...r) (gcc version 4.3.0 (Frugalware Linux) ) #1 SMP PREEMPT Wed Apr 30 05:51:39 CEST 2008 > >> [ 0.000000] Command line: root=/dev/sdb1 ro debug vga=0x317 mtrr_gran_size=128m > >> > >> > >> [ 0.000000] BIOS-provided physical RAM map: > >> [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009cc00 (usable) > >> [ 0.000000] BIOS-e820: 000000000009cc00 - 00000000000a0000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved) > >> [ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf550000 (usable) > >> [ 0.000000] BIOS-e820: 00000000cf550000 - 00000000cf55e000 (ACPI data) > >> [ 0.000000] BIOS-e820: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS) > >> [ 0.000000] BIOS-e820: 00000000cf5e0000 - 00000000cf600000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) > >> [ 0.000000] BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved) > >> [ 0.000000] BIOS-e820: 0000000100000000 - 000000012c000000 (usable) > >> [ 0.000000] Entering add_active_range(0, 0, 156) 0 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 256, 849232) 1 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 1048576, 1228800) 2 entries of 256 used > >> [ 0.000000] max_pfn_mapped = 1228800 > >> [ 0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106 > >> [ 0.000000] After WB checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 000000000012c000 > >> [ 0.000000] After UC checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000 > >> [ 0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000 > >> [ 0.000000] After sorting > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600 > >> [ 0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000 > >> [ 0.000000] range0: 0000000000000000 - 00000000c0000000 > >> [ 0.000000] Setting variable MTRR 0, base: 0MB, range: 2048MB, type WB > >> [ 0.000000] Setting variable MTRR 1, base: 2048MB, range: 1024MB, type WB > >> [ 0.000000] range: 00000000c0000000 - 00000000c8000000 > >> [ 0.000000] Setting variable MTRR 2, base: 3072MB, range: 128MB, type WB > >> [ 0.000000] rangeX: 00000000d0000000 - 00000000d0000000 > >> [ 0.000000] range0: 0000000100000000 - 0000000120000000 > >> [ 0.000000] Setting variable MTRR 3, base: 4096MB, range: 512MB, type WB > >> [ 0.000000] range: 0000000120000000 - 0000000128000000 > >> [ 0.000000] Setting variable MTRR 4, base: 4608MB, range: 128MB, type WB > >> [ 0.000000] DONE variable MTRRs > >> [ 0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new 0x7010600070106 > >> [ 0.000000] After WB checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000 > >> [ 0.000000] After UC checking > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000 > >> [ 0.000000] After sorting > >> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000 > >> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000 > >> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 181MB of RAM. > >> > >> [ 0.000000] update e820 for mtrr > >> > >> [ 0.000000] modified physical RAM map: > >> [ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable) > >> [ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved) > >> [ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved) > >> [ 0.000000] modified: 0000000000100000 - 00000000c8000000 (usable) > >> [ 0.000000] modified: 00000000c8000000 - 00000000cf550000 (reserved) > >> [ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data) > >> [ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS) > >> [ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved) > >> [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved) > >> > >> [ 0.000000] modified: 00000000ffc00000 - 0000000100000000 (reserved) > >> [ 0.000000] modified: 0000000100000000 - 0000000128000000 (usable) > >> [ 0.000000] modified: 0000000128000000 - 000000012c000000 (reserved) > >> > >> [ 0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 256, 819200) 3 entries of 256 used > >> [ 0.000000] Entering add_active_range(0, 1048576, 1212416) 3 entries of 256 used > >> > >> [ 0.000000] max_pfn_mapped = 1228800 > >> [ 0.000000] init_memory_mapping > >> > >> ... > >> > >> I will try tomorrow some more boot options but now I need some sleep ;) > > > > thanks. let's try different mtrr_chunk_size/mtrr_gran_size to get > > back more ram. > > under mtrr_gran_size=128m, does the your X server work well..., fast or slow? > > Yes X is fine and fast , it is even fine ( slower from my felling ) when I lose the 704MB. > In general with x86-latest.git tree things seems faster on that box , maybe there are some other bug fixes too. > > I've tested some mtrr_chunk_size/mtrr_gran_size combos, dmesg's are uploaded there : > > http://frugalware.org/~crazy/dmesg/mtrr/ > > Also setting lower values on mtrr_gran_size seems to give more RAM back , > mtrr_chunk_size 256/512 eats 704 MB and 128 doesn't seems to do something ? > > Other things I noticed ( probably you could add a note about in kernel-parameter.txt or some doc file ): > > Setting mtrr_gran_size to high , on my box >=512m hangs the box on boot , > setting it to low , on my box <=8m , will cause X to die with such a message : > > xf86MapVidMem: Could not mmap framebuffer (0xd0000000,0x10000000) (Invalid argument) > > If you want I can test such values for mtrr_chunk_size too , just let me know. > > To be honest I'm even fine when losing 700 - 800 MB as long X and everything else does work. > The other alternative for me for that problem without your patches will be to buy new ram ( 2 x 1G ) > and then I lose near 2,3G compared to now or live with broken X until xorg-server will support and > *work fine* with PAT ( most probably not that soon ). great. I am still working on 1. auto detect optimal chunk_size, gran_size 2. get back all RAM, at least only lose 1 or 2 M YH -- 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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