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Date: Mon, 12 May 2008 21:06:41 +0200 From: Mikael Pettersson <mikpe@...uu.se> To: David Miller <davem@...emloft.net> Cc: mikpe@...uu.se, sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [BUG] 2.6.26-rc1 lost half the RAM on UltraSPARC 5 David Miller writes: > From: Mikael Pettersson <mikpe@...uu.se> > Date: Wed, 7 May 2008 20:36:55 +0200 > > > Now that 2.6.26-rc1 boots on my Ultra5, I noticed that it > > reports having only 128MB RAM, while earlier kernels reported > > the correct amount: 256MB. > > > > A diff of the dmesg output from 2.6.25 and 2.6.26-rc1 shows: > > Try as I might I couldn't reproduce this, although I did find another > bug along the way. > > But that's OK, we'll add some debugging and fetch the necessary > information from your machine. > > The good news is that the early bootup does see all 256MB of your > memory: > > Top of RAM: 0x17f46000, Total RAM: 0xff40000 > Memory hole size: 128MB > Entering add_active_range(0, 0, 16384) 0 entries of 256 used > Entering add_active_range(0, 32768, 49023) 1 entries of 256 used > Entering add_active_range(0, 49024, 49053) 2 entries of 256 used > Entering add_active_range(0, 49055, 49059) 3 entries of 256 used > > That "0xff40000" value is 267649024 decimal, and the size of the page > ranges registered next match up. > > And yet we get: > > Memory: 127016k available (1920k kernel code, 744k data, 152k init) [fffff80000000000,0000000017f46000] > > which is strange. > > Between these two events there is only a handfull of bootmem > allocations, which together should not total 128MB on your > machine. :-) > > We have some existing debugging, which I'd like you to enable on the > boot command line. Simply add "numa=debug" and that'll get some more > vebose information. > > Please also add the debugging patch below. Right, 2.6.26-rc2 plus your debugging patch and booted with numa=debug prints the following: [ 0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.25.3 2000/06/29 14:12' [ 0.000000] PROMLIB: Root node compatible: [ 0.000000] Linux version 2.6.26-rc2-test (mikpe@...rge) (gcc version 4.2.3) #1 Mon May 12 19:22:10 CEST 2008 [ 0.000000] console [earlyprom0] enabled [ 0.000000] ARCH: SUN4U [ 0.000000] Ethernet address: 08:00:20:fd:ec:1f [ 0.000000] Found ramdisk at physical address 0x10800000, size 3683778 [ 0.000000] Kernel: Using 1 locked TLB entries for main kernel image. [ 0.000000] Remapping the kernel... done. [ 0.000000] OF stdout device is: /pci@1f,0/pci@1,1/SUNW,m64B@2 [ 0.000000] PROM: Built device tree with 46850 bytes of memory. [ 0.000000] bootmem_init_numa() [ 0.000000] bootmem_init_nonnuma() [ 0.000000] Top of RAM: 0x17f46000, Total RAM: 0xff40000 [ 0.000000] Memory hole size: 128MB [ 0.000000] Initializing tables for non-numa. [ 0.000000] Entering add_active_range(0, 0, 16384) 0 entries of 256 used [ 0.000000] Entering add_active_range(0, 32768, 49023) 1 entries of 256 used [ 0.000000] Entering add_active_range(0, 49024, 49053) 2 entries of 256 used [ 0.000000] Entering add_active_range(0, 49055, 49059) 3 entries of 256 used [ 0.000000] bootmem_init_one_node(0) [ 0.000000] init_bootmem_node(0, 3ffe, 0, bfa3) [ 0.000000] free_bootmem_with_active_regions(0, bfa3) [ 0.000000] trim_reserved_in_node(0) [ 0.000000] reserve_range_in_node(nid[0],start[7ffc000],end[7ffe000] [ 0.000000] MATCH reserving range [7ffc000:7ffe000] [ 0.000000] reserve_range_in_node(nid[0],start[7fff040],end[8000000] [ 0.000000] MATCH reserving range [7fff040:8001040] [ 0.000000] reserve_range_in_node(nid[0],start[10000000],end[10359f20] [ 0.000000] MATCH reserving range [10000000:1035a000] [ 0.000000] reserve_range_in_node(nid[0],start[107e8cc0],end[213835c2] [ 0.000000] MATCH reserving range [107e8cc0:21384cc0] [ 0.000000] sparse_memory_present_with_active_regions(0) [ 0.000000] __alloc_bootmem_core: size(8192) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] __alloc_bootmem_core: size(32768) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] __alloc_bootmem_core: size(48) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] __alloc_bootmem_core: size(4194304) align(4194304) goal[0x7ffffffffff] limit[0x0] [ 0.000000] [0000000200000000-fffff80000400000] page_structs=131072 node=0 entry=0/0 [ 0.000000] __alloc_bootmem_core: size(4194304) align(4194304) goal[0x7ffffffffff] limit[0x0] [ 0.000000] [0000000200000000-fffff80000800000] page_structs=131072 node=0 entry=1/0 [ 0.000000] Zone PFN ranges: [ 0.000000] Normal 0 -> 49059 [ 0.000000] Movable zone start PFN for each node [ 0.000000] early_node_map[4] active PFN ranges [ 0.000000] 0: 0 -> 16384 [ 0.000000] 0: 32768 -> 49023 [ 0.000000] 0: 49024 -> 49053 [ 0.000000] 0: 49055 -> 49059 [ 0.000000] On node 0 totalpages: 32672 [ 0.000000] Normal zone: 335 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 32337 pages, LIFO batch:7 [ 0.000000] __alloc_bootmem_core: size(4096) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] Movable zone: 0 pages used for memmap [ 0.000000] Booting Linux... [ 0.000000] __alloc_bootmem_core: size(29) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] __alloc_bootmem_core: size(29) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] __alloc_bootmem_core: size(64) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] Built 1 zonelists in Node order, mobility grouping on. Total pages: 32337 [ 0.000000] Policy zone: Normal [ 0.000000] Kernel command line: ro root=/dev/sda5 numa=debug [ 0.000000] __alloc_bootmem_core: size(32768) align(64) goal[0x7ffffffffff] limit[0x0] [ 0.000000] PID hash table entries: 1024 (order: 10, 8192 bytes) [ 0.000000] __alloc_bootmem_core: size(8192) align(64) goal[0x7ffffffffff] limit[0x0] [ 25.221347] clocksource: mult[28000] shift[16] [ 25.321537] clockevent: mult[66666666] shift[32] [ 25.422936] __alloc_bootmem_core: size(424) align(64) goal[0x7ffffffffff] limit[0x0] [ 25.422963] __alloc_bootmem_core: size(4000) align(64) goal[0x7ffffffffff] limit[0x0] [ 25.423055] Console: colour dummy device 80x25 [ 25.910678] console handover: boot [earlyprom0] -> real [tty0] [ 26.019608] __alloc_bootmem_core: size(262144) align(64) goal[0x7ffffffffff] limit[0x0] [ 26.021182] Dentry cache hash table entries: 32768 (order: 5, 262144 bytes) [ 26.021716] __alloc_bootmem_core: size(131072) align(64) goal[0x7ffffffffff] limit[0x0] [ 26.022488] Inode-cache hash table entries: 16384 (order: 4, 131072 bytes) [ 26.022748] __alloc_bootmem_core: size(16) align(64) goal[0x7ffffffffff] limit[0x0] [ 26.026505] free_all_bootmem_core: pfn[0x0] idx[0xbfa3] gofast(1) node_boot_start[0x0] [ 26.026758] free_all_bootmem_core: Freed pfn range [0x3a --> 0x200] [ 26.031939] free_all_bootmem_core: Freed pfn range [0x600 --> 0x3ffe] [ 26.032216] free_all_bootmem_core: Freed pfn range [0x81ad --> 0x83f4] [ 26.032341] Memory: 127064k available (2032k kernel code, 800k data, 152k init) [fffff80000000000,0000000017f46000] [ 26.032566] SLUB: Genslabs=14, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=16 [ 26.179691] Calibrating delay using timer specific routine.. 800.75 BogoMIPS (lpj=4003753) [ 26.180038] Mount-cache hash table entries: 512 [ 26.182670] net_namespace: 344 bytes [ 26.183637] NET: Registered protocol family 16 [ 26.197822] PCI: Probing for controllers. [ 26.201140] /pci@1f,0: SABRE PCI Bus Module [ 26.201192] /pci@1f,0: PCI IO[1fe02000000] MEM[1ff00000000] [ 26.201270] PCI: Scanning PBM /pci@1f,0 [ 26.205349] ebus0: [auxio] [power] [SUNW,pll] [se] [su] [su] [ecpp] [fdthree] [eeprom] [flashprom] [SUNW,CS4231] [ 26.208785] power: Control reg at 1fff1724000 [ 26.214386] SCSI subsystem initialized [ 26.214637] libata version 3.00 loaded. [ 26.230239] AUXIO: Found device at /pci@1f,0/pci@1,1/ebus@...uxio@14,726000 [ 26.230582] /pci@1f,0/pci@1,1/ebus@...eprom@14,0: Clock regs at 000001fff1000000 [ 26.233300] NET: Registered protocol family 2 [ 26.550041] IP route cache hash table entries: 2048 (order: 1, 16384 bytes) [ 26.551261] TCP established hash table entries: 8192 (order: 4, 131072 bytes) [ 26.551948] TCP bind hash table entries: 8192 (order: 3, 65536 bytes) [ 26.552300] TCP: Hash tables configured (established 8192 bind 8192) [ 26.552354] TCP reno registered [ 26.580007] NET: Registered protocol family 1 [ 26.580627] Unpacking initramfs... done [ 27.455017] Freeing initrd memory: 3597k freed [ 27.455794] Mini RTC Driver [ 27.480248] msgmni has been set to 255 for ipc namespace 00000000006b07d0 [ 27.481545] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254) [ 27.481631] io scheduler noop registered [ 27.481677] io scheduler anticipatory registered (default) [ 27.481725] io scheduler deadline registered [ 27.482589] io scheduler cfq registered [ 27.483143] atyfb: 3D RAGE PRO (Mach64 GP, PQFP, PCI) [0x4750 rev 0x7c] [ 27.484393] atyfb: 4M SGRAM (1:1), 14.31818 MHz XTAL, 230 MHz PLL, 100 Mhz MCLK, 100 MHz XCLK [ 27.484829] fbcon: ATY Mach64 (fb0) is primary device [ 27.562718] Console: switching to colour frame buffer device 160x64 [ 27.593689] atyfb: fb0: ATY Mach64 frame buffer device on PCI [ 27.610070] /pci@1f,0/pci@1,1/ebus@...u@14,3083f8: Keyboard port at 1fff13083f8, irq 6 [ 27.610530] /pci@1f,0/pci@1,1/ebus@...u@14,3062f8: Mouse port at 1fff13062f8, irq 7 [ 27.611497] f006159c: ttyS0 at MMIO 0x1fff1400000 (irq = 5) is a SAB82532 V3.2 [ 27.612311] f006159c: ttyS1 at MMIO 0x1fff1400040 (irq = 5) is a SAB82532 V3.2 [ 27.613450] Driver 'sd' needs updating - please use bus_type methods [ 27.614385] scsi0 : pata_cmd64x [ 27.615098] scsi1 : pata_cmd64x [ 27.615556] ata1: PATA max MWDMA2 cmd 0x1fe02c00000 ctl 0x1fe02c00008 bmdma 0x1fe02c00020 irq 14 [ 27.615910] ata2: PATA max MWDMA2 cmd 0x1fe02c00010 ctl 0x1fe02c00018 bmdma 0x1fe02c00028 irq 14 [ 27.616320] pata_cmd64x: active 10 recovery 10 setup 3. [ 27.616343] pata_cmd64x: active 10 recovery 10 setup 3. [ 27.790122] ata1.00: ATA-4: ST320420A, 3.21, max UDMA/66 [ 27.790346] ata1.00: 39851760 sectors, multi 0: LBA [ 27.790603] pata_cmd64x: active 3 recovery 1 setup 1. [ 27.790631] pata_cmd64x: active 3 recovery 1 setup 1. [ 27.830069] ata1.00: configured for MWDMA2 [ 27.830306] pata_cmd64x: active 10 recovery 10 setup 3. [ 27.830329] pata_cmd64x: active 10 recovery 10 setup 3. [ 28.010111] ata2.00: ATAPI: CRD-8483B, 1.00, max UDMA/33 [ 28.010367] pata_cmd64x: active 3 recovery 1 setup 1. [ 28.010392] pata_cmd64x: active 3 recovery 1 setup 1. [ 28.030077] ata2.00: configured for MWDMA2 [ 28.030703] scsi 0:0:0:0: Direct-Access ATA ST320420A 3.21 PQ: 0 ANSI: 5 [ 28.031739] sd 0:0:0:0: [sda] 39851760 512-byte hardware sectors (20404 MB) [ 28.032111] sd 0:0:0:0: [sda] Write Protect is off [ 28.032317] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 28.032479] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 28.033106] sd 0:0:0:0: [sda] 39851760 512-byte hardware sectors (20404 MB) [ 28.033465] sd 0:0:0:0: [sda] Write Protect is off [ 28.033676] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 28.033833] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 28.034192] sda: sda1 sda2 sda3 sda4 sda5 [ 28.040646] sd 0:0:0:0: [sda] Attached SCSI disk [ 28.041747] scsi 1:0:0:0: CD-ROM LG CD-ROM CRD-8483B 1.00 PQ: 0 ANSI: 5 [ 28.044017] mice: PS/2 mouse device common for all mice [ 28.694315] input: Sun Type 5 keyboard as /class/input/input0 [ 28.721130] input: Sun Mouse as /class/input/input1 [ 28.752541] TCP cubic registered [ 28.752695] NET: Registered protocol family 17 [ 29.749831] kjournald starting. Commit interval 5 seconds [ 29.757309] EXT3-fs: mounted filesystem with ordered data mode. [ 36.303502] PCI: Enabling device: (0000:01:01.1), cmd 2 [ 36.303535] sunhme.c:v3.00 June 23, 2006 David S. Miller (davem@...emloft.net) [ 36.305722] eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:fd:ec:1f [ 39.701765] EXT3 FS on sda5, internal journal [ 39.919869] kjournald starting. Commit interval 5 seconds [ 39.920286] EXT3 FS on sda1, internal journal [ 39.920311] EXT3-fs: mounted filesystem with ordered data mode. [ 39.938232] kjournald starting. Commit interval 5 seconds [ 39.938753] EXT3 FS on sda2, internal journal [ 39.938776] EXT3-fs: mounted filesystem with ordered data mode. [ 40.628505] Adding 1048808k swap on /dev/sda4. Priority:-1 extents:1 across:1048808k [ 46.099830] eth0: Link is up using internal transceiver at 100Mb/s, Full Duplex. One thing that bothers me is the "Memory hole size: 128MB" message. It wasn't present in 2.6.25, and the amount reported is the exact same amount of RAM I've lost. Or maybe I'm paranoid :-) /Mikael -- 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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