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    SubjectRe: 2.6.21-rc3-mm1
    Date
    Hello Mel, 

    > > > Today after +- 24h of uptime I found some more page allocation
    > > > failures ('eth1: Can't allocate skb for Rx'). You'll find more here:
    > > >
    > > > http://tuxland.pl/misc/2.6.21-rc3-mm1-page-allocation-failure.txt
    > > >
    > > > System wasn't doing anything unusual, as usual ;-) X, some p2p
    > > > software, firefox+flash playing music.
    > >
    > > Do other kernels do this, or is 2.6.21-rc3-mm1 worse?
    > >
    > > It is of course a non-fatal problem and will inevitably happen sometimes,
    > > but we would like the VM to be able to minimise the occurrence of this
    > > problem.
    >
    > Mariusz, I would be interested in finding out if this problem still occurs when
    > you set min_free_kbytes to 16384 via /proc/sys/vm/min_free_kbytes. I understand
    > that the problem is not easily reproduced and requiring configuration changes
    > is far from ideal but it'd allow me to find out if options 2 or 3 below make
    > sense in advance.

    After a few hours I can confirm that this happens with

    $ cat /proc/sys/vm/min_free_kbytes
    16384

    as well. See the syslog output below. Feel free to mail me to do some more tests.

    Regards,

    Mariusz Kozlowski


    Mar 15 12:00:47: echo 16384 > /proc/sys/vm/min_free_kbytes
    Mar 15 12:38:33: eth1: MAC controller error (WTERR). Ignoring.
    Mar 15 13:29:31: eth1: MAC controller error (WTERR). Ignoring.
    Mar 15 13:34:34: eth1: MAC controller error (WTERR). Ignoring.
    Mar 15 13:52:58: swapper: page allocation failure. order:1, mode:0x80020
    Mar 15 13:52:58: [<c0104664>] show_trace_log_lvl+0x1a/0x30
    Mar 15 13:52:58: [<c0104e00>] show_trace+0x12/0x14
    Mar 15 13:52:58: [<c0104eb7>] dump_stack+0x16/0x18
    Mar 15 13:52:58: [<c0150e8e>] __alloc_pages+0x2e6/0x2fd
    Mar 15 13:52:58: [<c0167556>] cache_alloc_refill+0x350/0x65d
    Mar 15 13:52:58: [<c0167957>] __kmalloc_track_caller+0xf4/0xf9
    Mar 15 13:52:58: [<c0396213>] __alloc_skb+0x6e/0x122
    Mar 15 13:52:58: [<ded154a9>] orinoco_interrupt+0x986/0x10a4 [orinoco]
    Mar 15 13:52:58: [<c0144d43>] handle_IRQ_event+0x28/0x59
    Mar 15 13:52:58: [<c01462f7>] handle_level_irq+0x6e/0xe7
    Mar 15 13:52:58: [<c0105e7e>] do_IRQ+0x3d/0x7f
    Mar 15 13:52:58: [<c01041d6>] common_interrupt+0x2e/0x34
    Mar 15 13:52:58: [<c0102352>] cpu_idle+0x46/0x74
    Mar 15 13:52:58: [<c0101131>] rest_init+0x37/0x46
    Mar 15 13:52:58: [<c0546bc1>] start_kernel+0x33c/0x3cb
    Mar 15 13:52:58: [<00000000>] 0x0
    Mar 15 13:52:58: =======================
    Mar 15 13:52:58: Mem-info:
    Mar 15 13:52:58: DMA per-cpu:
    Mar 15 13:52:58: CPU 0: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0
    Mar 15 13:52:58: Normal per-cpu:
    Mar 15 13:52:58: CPU 0: Hot: hi: 186, btch: 31 usd: 171 Cold: hi: 62, btch: 15 usd: 53
    Mar 15 13:52:58: Active:44723 inactive:54877 dirty:1323 writeback:0 unstable:0
    Mar 15 13:52:58: free:5602 slab:11245 mapped:7463 pagetables:284 bounce:0
    Mar 15 13:52:58: DMA free:2728kB min:544kB low:680kB high:816kB active:952kB inactive:3900kB present:16256kB pages_scanned:0 all_unreclaimable? no
    Mar 15 13:52:58: lowmem_reserve[]: 0 459 459
    Mar 15 13:52:58: Normal free:19680kB min:15836kB low:19792kB high:23752kB active:177940kB inactive:215608kB present:470856kB pages_scanned:0 all_unreclaimable? no
    Mar 15 13:52:58: lowmem_reserve[]: 0 0 0
    Mar 15 13:52:58: DMA: 682*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2728kB
    Mar 15 13:52:58: Normal: 4920*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 19680kB
    Mar 15 13:52:58: Swap cache: add 249823, delete 244938, find 35267/42320, race 3506+1
    Mar 15 13:52:58: Free swap = 462284kB
    Mar 15 13:52:58: Total swap = 498004kB
    Mar 15 13:52:58: Free swap: 462284kB
    Mar 15 13:52:58: 122736 pages of RAM
    Mar 15 13:52:58: 0 pages of HIGHMEM
    Mar 15 13:52:58: 2870 reserved pages
    Mar 15 13:52:58: 58717 pages shared
    Mar 15 13:52:58: 4885 pages swap cached
    Mar 15 13:52:58: 1323 pages dirty
    Mar 15 13:52:58: 0 pages writeback
    Mar 15 13:52:58: 7463 pages mapped
    Mar 15 13:52:58: 11245 pages slab
    Mar 15 13:52:58: 284 pages pagetables
    Mar 15 13:52:58: eth1: Can't allocate skb for Rx
    Mar 15 13:58:07: eth1: MAC controller error (WTERR). Ignoring.
    Mar 15 15:22:37: swapper: page allocation failure. order:1, mode:0x80020
    Mar 15 15:22:37: [<c0104664>] show_trace_log_lvl+0x1a/0x30
    Mar 15 15:22:37: [<c0104e00>] show_trace+0x12/0x14
    Mar 15 15:22:37: [<c0104eb7>] dump_stack+0x16/0x18
    Mar 15 15:22:37: [<c0150e8e>] __alloc_pages+0x2e6/0x2fd
    Mar 15 15:22:37: [<c0167556>] cache_alloc_refill+0x350/0x65d
    Mar 15 15:22:37: [<c0167957>] __kmalloc_track_caller+0xf4/0xf9
    Mar 15 15:22:37: [<c0396213>] __alloc_skb+0x6e/0x122
    Mar 15 15:22:37: [<ded154a9>] orinoco_interrupt+0x986/0x10a4 [orinoco]
    Mar 15 15:22:37: [<c0144d43>] handle_IRQ_event+0x28/0x59
    Mar 15 15:22:37: [<c01462f7>] handle_level_irq+0x6e/0xe7
    Mar 15 15:22:37: [<c0105e7e>] do_IRQ+0x3d/0x7f
    Mar 15 15:22:37: [<c01041d6>] common_interrupt+0x2e/0x34
    Mar 15 15:22:37: [<c0102352>] cpu_idle+0x46/0x74
    Mar 15 15:22:37: [<c0101131>] rest_init+0x37/0x46
    Mar 15 15:22:37: [<c0546bc1>] start_kernel+0x33c/0x3cb
    Mar 15 15:22:37: [<00000000>] 0x0
    Mar 15 15:22:37: =======================
    Mar 15 15:22:37: Mem-info:
    Mar 15 15:22:37: DMA per-cpu:
    Mar 15 15:22:37: CPU 0: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0
    Mar 15 15:22:37: Normal per-cpu:
    Mar 15 15:22:37: CPU 0: Hot: hi: 186, btch: 31 usd: 141 Cold: hi: 62, btch: 15 usd: 55
    Mar 15 15:22:37: Active:53226 inactive:50830 dirty:338 writeback:0 unstable:0
    Mar 15 15:22:37: free:6554 slab:5865 mapped:7463 pagetables:284 bounce:0
    Mar 15 15:22:37: DMA free:2676kB min:544kB low:680kB high:816kB active:940kB inactive:4728kB present:16256kB pages_scanned:0 all_unreclaimable? no
    Mar 15 15:22:37: lowmem_reserve[]: 0 459 459
    Mar 15 15:22:37: Normal free:23540kB min:15836kB low:19792kB high:23752kB active:211964kB inactive:198592kB present:470856kB pages_scanned:0 all_unreclaimable? no
    Mar 15 15:22:37: lowmem_reserve[]: 0 0 0
    Mar 15 15:22:37: DMA: 665*4kB 2*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2676kB
    Mar 15 15:22:37: Normal: 5595*4kB 145*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 23540kB
    Mar 15 15:22:37: Swap cache: add 249823, delete 244940, find 35267/42320, race 3506+1
    Mar 15 15:22:37: Free swap = 462284kB
    Mar 15 15:22:37: Total swap = 498004kB
    Mar 15 15:22:37: Free swap: 462284kB
    Mar 15 15:22:37: 122736 pages of RAM
    Mar 15 15:22:37: 0 pages of HIGHMEM
    Mar 15 15:22:37: 2870 reserved pages
    Mar 15 15:22:37: 63457 pages shared
    Mar 15 15:22:37: 4883 pages swap cached
    Mar 15 15:22:37: 338 pages dirty
    Mar 15 15:22:37: 0 pages writeback
    Mar 15 15:22:37: 7463 pages mapped
    Mar 15 15:22:37: 5865 pages slab
    Mar 15 15:22:37: 284 pages pagetables
    Mar 15 15:22:37: eth1: Can't allocate skb for Rx
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