Ä¿³Î ¸Þ¼¼Áö page allocation failure

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Compute노드 중에 하나가 또 느려져서 보니까 messages가 난리가 났네요. 메모리 큰 잡들을 돌리고 있는데 저 노드만 저러고 있어요. CentOS 7.5 쓰고 있습니다. IB 문제같은데 비슷한 키워드는 나와도 같은 에러 메시지는 아니더라고요. 어찌 방법을 찾아야 할까요?


 Feb 25 22:42:14 compute-01-09 kernel: kworker/12:0: page allocation failure: order:10, mode:0x80d0

Feb 25 22:42:14 compute-01-09 kernel: CPU: 12 PID: 70801 Comm: kworker/12:0 Kdump: loaded Not tainted 3.10.0-862.el7.x86_64 #1
Feb 25 22:42:14 compute-01-09 kernel: Hardware name: Dell Inc. PowerEdge R7425/08V001, BIOS 1.5.6 08/17/2018
Feb 25 22:42:14 compute-01-09 kernel: Workqueue: events xprt_rdma_connect_worker [rpcrdma]
Feb 25 22:42:14 compute-01-09 kernel: Call Trace:
Feb 25 22:42:14 compute-01-09 kernel: [] dump_stack+0x19/0x1b
Feb 25 22:42:14 compute-01-09 kernel: [] warn_alloc_failed+0x110/0x180
Feb 25 22:42:14 compute-01-09 kernel: [] ? drain_pages+0xb0/0xb0
Feb 25 22:42:14 compute-01-09 kernel: [] __alloc_pages_nodemask+0x9b4/0xbb0
Feb 25 22:42:14 compute-01-09 kernel: [] dma_generic_alloc_coherent+0x8f/0x140
Feb 25 22:42:14 compute-01-09 kernel: [] x86_swiotlb_alloc_coherent+0x21/0x50
Feb 25 22:42:14 compute-01-09 kernel: [] mlx5_dma_zalloc_coherent_node+0xb4/0x110 [mlx5_core]
Feb 25 22:42:14 compute-01-09 kernel: [] mlx5_buf_alloc_node+0x4d/0xc0 [mlx5_core]
Feb 25 22:42:14 compute-01-09 kernel: [] mlx5_buf_alloc+0x14/0x20 [mlx5_core]
Feb 25 22:42:14 compute-01-09 kernel: [] create_kernel_qp.isra.62+0x42e/0x72c [mlx5_ib]
Feb 25 22:42:14 compute-01-09 kernel: [] create_qp_common+0x67d/0x13c0 [mlx5_ib]
Feb 25 22:42:14 compute-01-09 kernel: [] ? internal_add_timer+0x70/0x70
Feb 25 22:42:14 compute-01-09 kernel: [] ? kmem_cache_alloc_trace+0x1d6/0x200
Feb 25 22:42:14 compute-01-09 kernel: [] mlx5_ib_create_qp+0x10b/0x4d0 [mlx5_ib]
Feb 25 22:42:14 compute-01-09 kernel: [] ? list_del+0xd/0x30
Feb 25 22:42:14 compute-01-09 kernel: [] ? wait_for_completion_interruptible_timeout+0x131/0x170
Feb 25 22:42:14 compute-01-09 kernel: [] ib_create_qp+0x7f/0x330 [ib_core]
Feb 25 22:42:14 compute-01-09 kernel: [] rdma_create_qp+0x34/0xb0 [rdma_cm]
Feb 25 22:42:14 compute-01-09 kernel: [] rpcrdma_ep_connect+0x183/0x3e0 [rpcrdma]
Feb 25 22:42:14 compute-01-09 kernel: [] xprt_rdma_connect_worker+0x3c/0xc0 [rpcrdma]
Feb 25 22:42:14 compute-01-09 kernel: [] process_one_work+0x17f/0x440
Feb 25 22:42:14 compute-01-09 kernel: [] worker_thread+0x126/0x3c0
Feb 25 22:42:14 compute-01-09 kernel: [] ? manage_workers.isra.24+0x2a0/0x2a0
Feb 25 22:42:14 compute-01-09 kernel: [] kthread+0xd1/0xe0
Feb 25 22:42:14 compute-01-09 kernel: [] ? insert_kthread_work+0x40/0x40
Feb 25 22:42:14 compute-01-09 kernel: [] ret_from_fork_nospec_begin+0xe/0x21
Feb 25 22:42:14 compute-01-09 kernel: [] ? insert_kthread_work+0x40/0x40
Feb 25 22:42:14 compute-01-09 kernel: Mem-Info:
Feb 25 22:42:14 compute-01-09 kernel: active_anon:11826266 inactive_anon:1659285 isolated_anon:0#012 active_file:24938058 inactive_file:25116811 isolated_file:0#012 unevictable:0 dirty:134 writeback:865547 unstable:1566927#012 slab_reclaimable:379760 slab_unreclaimable:172249#012 mapped:26843 shmem:43502 pagetables:30261 bounce:0#012 free:1077590 free_pcp:8 free_cma:0
Feb 25 22:42:14 compute-01-09 kernel: Node 0 DMA free:15864kB min:12kB low:12kB high:16kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15904kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:40kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Feb 25 22:42:14 compute-01-09 kernel: lowmem_reserve[]: 0 1481 31659 31659

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Ȥ½Ã ¸ð¸£´Ï ¾Æ·¡ ¸í·ÉÀ¸·Î manual compaction ÀÌ¶óµµ Çѹø Çغ¸¼¼¿ä:
# echo 1 > /proc/sys/vm/compact_memory
     
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3.10 ¿¡¼­ »ç¿ëÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀº ¾ø³ª¿ä? Ä¿³Î ¾÷±Û¿¡ ¿ØÁö ¸ð¸¦ ºÒ¾ÈÇÔÀÌ. ±×·±µ¥ Ä¿³Î ¹Ù²Ù´Â °ÍÀ¸·Î¸¸ ÇØ°áÀÌ µÈ´Ù¸é ±×°Íµµ ºÒ°¡ÇÇ Çغ¸À̳׿ä.
                    
½º¿ÒÀÌ ÀÖ´Ù¸é compactionÀÌ ¾ÈµÅµµ Á» ´À¸®Áö¸¸ ºñ½ÁÇÑ ±â´ÉÀ» ÇÑ´Ù°í º¸¼Åµµ µË´Ï´Ù. ±×¸®°í ¾îÂ÷ÇÇ compactionÀ̳ª ½º¿ÒÀ̳ª.. fragmentation ¹®Á¦ ÇØ°áÀ» À§ÇØ ÃÖ´ëÇÑ Çغ¸´Âµ¥ º¸ÀåÀº ¸øÇÕ´Ï´Ù. ±×·¡¼­ µå¶óÀ̹ö¿¡¼­ ¸Þ¸ð¸®¸¦ »ç¿ëÇÏ´Â ¹æ½ÄÀÌ ÈξÀ Áß¿äÇÕ´Ï´Ù. µå¶óÀ̹ö ¾÷µ¥ÀÌÆ®¸¦ Çϼ̴ٸé ÀÏ´Ü ½áº¸½Ã¸é¼­ changelog¸¦ ÀÚ¼¼È÷ Çѹø º¸½ÃÁÒ. ¸á¶ó³ì½º¿¡ ¸®Æ÷Æ®¸¦ Çغ¸´Â °Íµµ ±¦ÂúÀ» µí ÇÕ´Ï´Ù.
                         
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epowergate 2020-02
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±× ³ëµåÀÇ meminfo Á¤º¸¸¦ ¿Ã·ÁÁÖ½Ã¸é µµ¿òÀÌ µÉ°Í °°½À´Ï´Ù.

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Àúµµ ÀÚ°ß¿¡ EPYC¿¡ IB Å×½ºÆ® Çϸ鼭 °í»ý Á» Çß¾ú½À´Ï´Ù.
     
¾ù, ¸Þ¸ð¸®°¡ ºÎÁ·Çϸé OOMÀÌ ¸ÕÀú ¹ßµ¿ÇÏ´Â°Ô µðÆúÆ®¾Æ´Ñ°¡¿ä ??

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epowergate 2020-02
RDMA´Â Remote¿¡ ¸Þ¸ð¸®´Â Àâ´Â ¹æ½ÄÀε¥ ¿ì¸®°¡ ÈçÀÌÇÏ´Â OOM°ú´Â ¿¡·¯°¡ ¹ß»ýÇÏ´Â ¹æ½ÄÀÌ Á» ´Ù¸¨´Ï´Ù.
º¸Åë MM°¡ ºÎÁ·Çϸé SWAPÀ¸·Î °¥¼öµµ ÀÖÁÒ?  ±×·±µ¥ RDMA·Î ¸Þ¸ð¸®¸¦ ÀâÀ¸·Á ÇÏ´Ù MM°¡ ºÎÁ·Çϸé SWAPÀ¸·Î °¡¾ßÇÏ´Â°Ô ¸ÂÀ»±î¿ä?
ÀÌ ºÎºÐµµ ¼³Á¤ÀÌ Àִµ¥ ±â¾ïÀÌ ³ªÁú ¾Ê½À´Ï´Ù.
Kernel ¹öÀü¸¶´Ù ¹æ½ÄÀÌ ´Ù¸¦°Ì´Ï´Ù.  Á¦°¡ ¾Æ´Â°Ç 15³âÀü RDMA¶ó...
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meminfo´Â ´Ù½Ã ºñ½ÁÇÑ »óȲÀÌ ³ª¿À¸é ¸®Ç÷Π¾÷µ¥ÀÌÆ® ÇÒ°Ô¿ä. À¯Àú ´Ù ³ª°¡°í Á¦°¡ ³ëµå¿¡¼­ ºÎÇÏ Å« ÀÛ¾÷ Çغôµ¥ ±¦Âú´õ¶ó±¸¿ä. ¹®Á¦°¡ ´Ù½Ã ³ª¿Í¾ß Çϴµ¥ ´ä´äÇϳ׿ä. ¸»¾¸ÇϽŠ¼³Á¤ ºÎºÐÀº rdma ¹®¼­¿¡¼­ ã¾ÆºÁ¾ß°Ú³×¿ä. ¹®Á¦ »ý°åÀ» ¶§ ¹¹¶óµµ ÇؾßÇϴϱî¿ä.
          
³× epyc »ç¿ëÁßÀÔ´Ï´Ù. ¹®Á¦¸¦ ÀÏÀ¸Å² ³ëµå º¸¸é ½º¿ÒÀ̶óµçÁö ¸Þ¸ð¸® À̽´´Â Å©°Ô ¾ø¾ú´Âµ¥ ÀÌ·¯³×¿ä. ´Ù½Ã ÇÑ ¹ø È®ÀÎÇغ¸°Ú½À´Ï´Ù.
ªÀº Áö½ÄÀ¸·Î´Â oomÀÌ ¶°¾ß Çϴµ¥ Ä¿³ÎÀÌ Á¦´ë·Î ÀÏÀ» ¸øÇÏ°í ÀÖ³ª ¶ó°í »ý°¢Çߴµ¥ µ¿ÀÛÇÏ´Â µ¿ÀÛÇÏ´Â ¹æ½ÄÀÌ ´Ù¸£³×¿ä.
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Ȥ½Ã DELL ÂÊ¿¡ ±â¼úÁö¿ø ¹ÞÀ¸½Ç¼ö ÀÖÀ¸½Ã´Ù¸é Àú ¸Þ¼¼Áö µîµîÀ» DELL ¿£Áö´Ï¾î¿¡°Ô º¸³»¼­ ºÐ¼®ÇØ´Þ¶ó°í Çϼ¼¿ä..
     
¸Þ¼¼Áö º¸³»ºÁ¾ß°Ú³×¿ä. epowergate´Ô²²¼­ ¾ð±ÞÇϼ̴٠Epyc, rdma¶§¹®¿¡¶óµµ ¹°¾îºÁ¾ß°Ú¾î¿ä.
          
CentOS ¾´´Ù°í ¼­Æ÷Æ® ¸øÇØÁØ´Ù°í ±×·¯³×¿ä. ÀÚ±â³× ÂÊ¿¡¼­ ó¸®ÇÒ ¼ö ÀÖ´Â°Ô ÇÑ°è°¡ ÀÖ´Ù°í ±×·¯°Ô¿ä. ¸á¶ó³ì½º¿¡ º¸³»µçÁö Çؾ߰ھî¿ä.


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