@Eric: How can I check status of fscache? Why can it be root cause? Thanks
2017-11-18 7:30 GMT+07:00 Eric Nelson <ericnel...@gmail.com>: > One thing that doesn't show up is fs cache, which is likely the cause > here. We went through this on our SSDs and had to add the following to stop > the crashes. I believe vm.vfs_cache_pressure and min_free_kbytes were the > really helpful things in getting the crashes to stop. HTH! > > sysctl_param 'vm.vfs_cache_pressure' do > > value 400 > > end > > sysctl_param 'vm.dirty_ratio' do > > value 20 > > end > > sysctl_param 'vm.dirty_background_ratio' do > > value 2 > > end > > sysctl_param 'vm.min_free_kbytes' do > > value 4194304 > > end > > > > On Fri, Nov 17, 2017 at 4:24 PM, Sam Huracan <nowitzki.sa...@gmail.com> > wrote: > >> I see some more logs about memory in syslog: >> >> Nov 17 10:47:17 ceph1 kernel: [2810698.553749] Node 0 DMA free:14828kB >> min:32kB low:40kB high:48kB active_anon:0kB inactive_anon:0kB >> active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB >> isolated(file):0kB present:15996kB managed:15896kB mlocked:0kB dirty:0kB >> writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB >> slab_unreclaimable:0kB 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 >> Nov 17 10:47:17 ceph1 kernel: [2810698.553753] lowmem_reserve[]: 0 1830 >> 32011 32011 32011 >> Nov 17 10:47:17 ceph1 kernel: [2810698.553755] Node 0 DMA32 free:134848kB >> min:3860kB low:4824kB high:5788kB active_anon:120628kB >> inactive_anon:121792kB active_file:653404kB inactive_file:399272kB >> unevictable:0kB isolated(anon):0kB isolated(file):36kB present:1981184kB >> managed:1900752kB mlocked:0kB dirty:344kB writeback:0kB mapped:1200kB >> shmem:0kB slab_reclaimable:239900kB slab_unreclaimable:154560kB >> kernel_stack:43376kB pagetables:1176kB unstable:0kB bounce:0kB free_pcp:0kB >> local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 >> all_unreclaimable? no >> Nov 17 10:47:17 ceph1 kernel: [2810698.553758] lowmem_reserve[]: 0 0 >> 30180 30180 30180 >> Nov 17 10:47:17 ceph1 kernel: [2810698.553760] Node 0 Normal >> free:237232kB min:63684kB low:79604kB high:95524kB active_anon:3075228kB >> inactive_anon:629052kB active_file:12544336kB inactive_file:12570716kB >> unevictable:0kB isolated(anon):0kB isolated(file):0kB present:31457280kB >> managed:30905084kB mlocked:0kB dirty:74368kB writeback:3796kB >> mapped:48516kB shmem:1276kB slab_reclaimable:713684kB >> slab_unreclaimable:416404kB kernel_stack:40896kB pagetables:25288kB >> unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB >> writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no >> Nov 17 10:47:17 ceph1 kernel: [2810698.553763] lowmem_reserve[]: 0 0 0 0 0 >> Nov 17 10:47:17 ceph1 kernel: [2810698.553765] Node 0 DMA: 1*4kB (U) >> 1*8kB (U) 0*16kB 1*32kB (U) 3*64kB (U) 2*128kB (U) 0*256kB 0*512kB 0*1024kB >> 1*2048kB (M) 3*4096kB (M) = 14828kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553772] Node 0 DMA32: 10756*4kB >> (UME) 11442*8kB (UME) 25*16kB (UE) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB >> 0*1024kB 0*2048kB 0*4096kB = 134960kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553777] Node 0 Normal: 59473*4kB >> (UME) 77*8kB (U) 10*16kB (H) 8*32kB (H) 6*64kB (H) 2*128kB (H) 1*256kB (H) >> 1*512kB (H) 0*1024kB 0*2048kB 0*4096kB = 240332kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553784] Node 0 hugepages_total=0 >> hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553784] Node 0 hugepages_total=0 >> hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553785] 6544612 total pagecache >> pages >> Nov 17 10:47:17 ceph1 kernel: [2810698.553786] 2347 pages in swap cache >> Nov 17 10:47:17 ceph1 kernel: [2810698.553787] Swap cache stats: add >> 2697126, delete 2694779, find 38874122/39241548 >> Nov 17 10:47:17 ceph1 kernel: [2810698.553788] Free swap = 61498092kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553788] Total swap = 62498812kB >> Nov 17 10:47:17 ceph1 kernel: [2810698.553789] 8363615 pages RAM >> Nov 17 10:47:17 ceph1 kernel: [2810698.553790] 0 pages HighMem/MovableOnly >> Nov 17 10:47:17 ceph1 kernel: [2810698.553790] 158182 pages reserved >> Nov 17 10:47:17 ceph1 kernel: [2810698.553791] 0 pages cma reserved >> >> Is it relate to page caches? >> >> 2017-11-18 7:22 GMT+07:00 Sam Huracan <nowitzki.sa...@gmail.com>: >> >>> Today, one of our Ceph OSDs was down, I've check syslog and see this OSD >>> process was killed by OMM >>> >>> >>> Nov 17 10:01:06 ceph1 kernel: [2807926.762304] Out of memory: Kill >>> process 3330 (ceph-osd) score 7 or sacrifice child >>> Nov 17 10:01:06 ceph1 kernel: [2807926.763745] Killed process 3330 >>> (ceph-osd) total-vm:2372392kB, anon-rss:559084kB, file-rss:7268kB >>> Nov 17 10:01:06 ceph1 kernel: [2807926.985830] init: ceph-osd (ceph/6) >>> main process (3330) killed by KILL signal >>> Nov 17 10:01:06 ceph1 kernel: [2807926.985844] init: ceph-osd (ceph/6) >>> main process ended, respawning >>> Nov 17 10:03:39 ceph1 bash: root [15524]: sudo ceph health detail [0] >>> Nov 17 10:03:40 ceph1 bash: root [15524]: sudo ceph health detail [0] >>> Nov 17 10:17:01 ceph1 CRON[75167]: (root) CMD ( cd / && run-parts >>> --report /etc/cron.hourly) >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553690] ceph-status.sh invoked >>> oom-killer: gfp_mask=0x26000c0, order=2, oom_score_adj=0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553693] ceph-status.sh cpuset=/ >>> mems_allowed=0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553697] CPU: 5 PID: 194271 Comm: >>> ceph-status.sh Not tainted 4.4.0-62-generic #83~14.04.1-Ubuntu >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553698] Hardware name: Dell Inc. >>> PowerEdge R730xd/072T6D, BIOS 2.5.5 08/16/2017 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553699] 0000000000000000 >>> ffff88001a857b38 ffffffff813dc4ac ffff88001a857cf0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553701] 0000000000000000 >>> ffff88001a857bc8 ffffffff811fb066 ffff88083d29e200 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553703] ffff88001a857cf0 >>> ffff88001a857c00 ffff8808453cf000 0000000000000000 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553704] Call Trace: >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553709] [<ffffffff813dc4ac>] >>> dump_stack+0x63/0x87 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553713] [<ffffffff811fb066>] >>> dump_header+0x5b/0x1d5 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553717] [<ffffffff81188b75>] >>> oom_kill_process+0x205/0x3d0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553718] [<ffffffff8118857e>] ? >>> oom_unkillable_task+0x9e/0xc0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553720] [<ffffffff811891ab>] >>> out_of_memory+0x40b/0x460 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553722] [<ffffffff811fbb1f>] >>> __alloc_pages_slowpath.constprop.87+0x742/0x7ad >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553725] [<ffffffff8118e1a7>] >>> __alloc_pages_nodemask+0x237/0x240 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553727] [<ffffffff8118e36d>] >>> alloc_kmem_pages_node+0x4d/0xd0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553730] [<ffffffff8107c125>] >>> copy_process+0x185/0x1ce0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553732] [<ffffffff813320f3>] ? >>> security_file_alloc+0x33/0x50 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553734] [<ffffffff8107de1a>] >>> _do_fork+0x8a/0x310 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553737] [<ffffffff8108dc01>] ? >>> sigprocmask+0x51/0x80 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553738] [<ffffffff8107e149>] >>> SyS_clone+0x19/0x20 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553743] [<ffffffff81802d36>] >>> entry_SYSCALL_64_fastpath+0x16/0x75 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553744] Mem-Info: >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] active_anon:798964 >>> inactive_anon:187711 isolated_anon:0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] active_file:3299435 >>> inactive_file:3242497 isolated_file:9 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] unevictable:0 >>> dirty:18678 writeback:949 unstable:0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] slab_reclaimable:238396 >>> slab_unreclaimable:142741 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] mapped:12429 shmem:319 >>> pagetables:6616 bounce:0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553747] free:96727 free_pcp:0 >>> free_cma:0 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553749] Node 0 DMA free:14828kB >>> min:32kB low:40kB high:48kB active_anon:0kB inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB >>> isolated(file):0kB present:15996kB managed:15896kB mlocked:0kB dirty:0kB >>> writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB >>> slab_unreclaimable:0kB 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 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553753] lowmem_reserve[]: 0 1830 >>> 32011 32011 32011 >>> Nov 17 10:47:17 ceph1 kernel: [2810698.553755] Node 0 DMA32 >>> free:134848kB min:3860kB low:4824kB high:5788kB active_anon:120628kB >>> inactive_anon:121792kB active_file:653404kB inactive_file:399272kB >>> unevictable:0kB isolated(anon):0kB isolated(file):36kB present:1981184kB >>> managed:1900752kB mlocked:0kB dirty:344kB writeback:0kB mapped:1200kB >>> shmem:0kB slab_reclaimable:239900kB slab_unreclaimable:154560kB >>> kernel_stack:43376kB pagetables:1176kB unstable:0kB bounce:0kB free_pcp:0kB >>> local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 >>> all_unreclaimable? no >>> >>> >>> We check free Memory, Cache is free 24,705 MB >>> >>> root@ceph1:/var/log# free -m >>> total used free shared buffers cached >>> Mem: 32052 31729 323 1 125 24256 >>> -/+ buffers/cache: 7347 24705 >>> Swap: 61033 120 60913 >>> >>> >>> >>> It's so weird. Could you help me solve this problem, I'm afraid it 'll >>> come again. >>> >>> Thanks in advance. >>> >>> >>> >>> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >
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