Hello，guys：
We met with some difficulties when testing our own application based on DM8168 & DVRRDK 3.0.We use a PCI-E net interface card (RTL8111) to receive TCP data and write them to a sata disk. After the app running for a period of time, more than an hour,the kernel prints"swapper: page allocation failure. order:0, mode:0x4020".
The command "top" shows the info as follow：
Mem: 229112K used, 4804K free, 0K shrd, 30228K buff, 162108K cached
CPU: 2% usr 11% sys 0% nic 81% idle 3% io 0% irq 1% sirq
Load average: 0.21 0.63 1.96 3/60 1140
PID PPID USER STAT VSZ %MEM %CPU COMMAND
1117 1113 root S 55228 24% 12% ./hb154-tcpd
We can see the app only takes 24% of the memory，we'll be so appreciated if anyone of you could show some useful advice to solve this problem.
Detail log info:
swapper: page allocation failure. order:0, mode:0x4020
Backtrace:
[<8004ab7c>] (dump_backtrace+0x0/0x10c) from [<803c709c>] (dump_stack+0x18/0x1c)
r7:8e402400 r6:00004020 r5:003fffff r4:00000000
[<803c7084>] (dump_stack+0x0/0x1c) from [<800aa044>] (__alloc_pages_nodemask+0x)
[<800a9b7c>] (__alloc_pages_nodemask+0x0/0x51c) from [<800c7540>] (new_slab+0x8)
[<800c74c0>] (new_slab+0x0/0x218) from [<800c7824>] (__slab_alloc+0x14c/0x228)
r9:8d484340 r8:ffffffff r7:00000020 r6:8e402400 r5:00000000
r4:8e401100
[<800c76d8>] (__slab_alloc+0x0/0x228) from [<800c7990>] (__kmalloc_track_caller)
[<800c7900>] (__kmalloc_track_caller+0x0/0xc8) from [<8033f5b4>] (__alloc_skb+0)
r8:803405fc r7:00000640 r6:00000020 r5:8bd420c0 r4:8e402100
[<8033f55c>] (__alloc_skb+0x0/0xe8) from [<803405fc>] (dev_alloc_skb+0x20/0x44)
[<803405dc>] (dev_alloc_skb+0x0/0x44) from [<7f00282c>] (rtl8168_rx_fill+0x54/0)
[<7f0027d8>] (rtl8168_rx_fill+0x0/0x108 [r8168]) from [<7f002bf8>] (rtl8168_rx_)
[<7f0028e0>] (rtl8168_rx_interrupt+0x0/0x3b0 [r8168]) from [<7f00719c>] (rtl816)
[<7f006f2c>] (rtl8168_interrupt+0x0/0x414 [r8168]) from [<8009c62c>] (handle_IR)
[<8009c600>] (handle_IRQ_event+0x0/0xec) from [<8009e810>] (handle_level_irq+0x)
r7:00000031 r6:8054eb98 r5:00000170 r4:8052b9f4
[<8009e764>] (handle_level_irq+0x0/0x11c) from [<8005ea78>] (ti81xx_msi_handler)
r5:80525148 r4:00000170
[<8005ea08>] (ti81xx_msi_handler+0x0/0xb0) from [<8003c07c>] (asm_do_IRQ+0x7c/0)
r7:8050c0f4 r6:8002f5dc r5:00000000 r4:00000031
[<8003c000>] (asm_do_IRQ+0x0/0xa0) from [<803c9134>] (__irq_svc+0x34/0xa0)
Exception stack(0x80509f48 to 0x80509f90)
9f40: 81600281 40000013 80509f90 00000814 00000816 8054e680
9f60: 8002f5dc 8050c0f4 80000000 413fc082 0000001f 80509fa4 80509f90 80509f90
9f80: 80047f4c 80047f50 20000013 ffffffff
r5:fa200000 r4:ffffffff
[<80047ee4>] (default_idle+0x0/0x78) from [<800484f8>] (cpu_idle+0x50/0x90)
r5:8054e680 r4:80508000
[<800484a8>] (cpu_idle+0x0/0x90) from [<803bdb9c>] (rest_init+0x60/0x78)
r5:8054e680 r4:805729b4
[<803bdb3c>] (rest_init+0x0/0x78) from [<80008c6c>] (start_kernel+0x258/0x2ac)
[<80008a14>] (start_kernel+0x0/0x2ac) from [<80008044>] (stext+0x44/0x54)
Mem-info:
Normal per-cpu:
CPU 0: hi: 90, btch: 15 usd: 42
active_anon:458 inactive_anon:21 isolated_anon:0
active_file:6984 inactive_file:41493 isolated_file:32
unevictable:0 dirty:8293 writeback:1218 unstable:0
free:182 slab_reclaimable:6355 slab_unreclaimable:1915
mapped:346 shmem:34 pagetables:67 bounce:0
Normal free:728kB min:1956kB low:2444kB high:2932kB active_anon:1832kB inactiveo
lowmem_reserve[]: 0 0 0
Normal: 176*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2B
48542 total pagecache pages
65536 pages of RAM
333 free pages
7057 reserved pages
7628 slab pages
49814 pages shared
0 pages swap cached
SLUB: Unable to allocate memory on node -1 (gfp=0x20)
cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 2, 0
node 0: slabs: 563, objs: 2140, free: 0
Best wishes!
