-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Are you backporting that to hammer? We'd love it. - ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Fri, Jan 8, 2016 at 9:28 AM, Nick Fisk wrote: > There was/is a bug in Infernalis and older, where objects will always get promoted on the 2nd read/write regardless of what you set the min_recency_promote settings to. This can have a dramatic effect on performance. I wonder if this is what you are experiencing? > > This has been fixed in Jewel https://github.com/ceph/ceph/pull/6702 . > > You can compile the changes above to see if it helps or I have a .deb for Infernalis where this is fixed if it's easier. > > Nick > >> -----Original Message----- >> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of >> Wade Holler >> Sent: 08 January 2016 16:14 >> To: hnuzhoulin ; ceph-devel@xxxxxxxxxxxxxxx >> Cc: ceph-users@xxxxxxxx >> Subject: Re: using cache-tier with writeback mode, raods bench >> result degrade >> >> My experience is performance degrades dramatically when dirty objects are >> flushed. >> >> Best Regards, >> Wade >> >> >> On Fri, Jan 8, 2016 at 11:08 AM hnuzhoulin wrote: >> Hi,guyes >> Recentlly,I am testing cache-tier using writeback mode.but I found a >> strange things. >> the performance using rados bench degrade.Is it correct? >> If so,how to explain.following some info about my test: >> >> storage node:4 machine,two INTEL SSDSC2BB120G4(one for systaem,the >> other >> one used as OSD),four sata as OSD. >> >> before using cache-tier: >> root@ceph1:~# rados bench -p coldstorage 300 write --no-cleanup >> ---------------------------------------------------------------- >> Total time run: 301.236355 >> Total writes made: 6041 >> Write size: 4194304 >> Bandwidth (MB/sec): 80.216 >> >> Stddev Bandwidth: 10.5358 >> Max bandwidth (MB/sec): 104 >> Min bandwidth (MB/sec): 0 >> Average Latency: 0.797838 >> Stddev Latency: 0.619098 >> Max latency: 4.89823 >> Min latency: 0.158543 >> >> root@ceph1:/root/cluster# rados bench -p coldstorage 300 seq >> Total time run: 133.563980 >> Total reads made: 6041 >> Read size: 4194304 >> Bandwidth (MB/sec): 180.917 >> >> Average Latency: 0.353559 >> Max latency: 1.83356 >> Min latency: 0.027878 >> >> after configure cache-tier: >> root@ubuntu:~/benchmarkcollect/Monitor# ceph osd tier add coldstorage >> hotstorage >> pool 'hotstorage' is now (or already was) a tier of 'coldstorage' >> >> root@ubuntu:~/benchmarkcollect/Monitor# ceph osd tier cache-mode >> hotstorage writeback >> set cache-mode for pool 'hotstorage' to writeback >> >> root@ubuntu:~/benchmarkcollect/Monitor# ceph osd tier set-overlay >> coldstorage hotstorage >> overlay for 'coldstorage' is now (or already was) 'hotstorage' >> >> oot@ubuntu:~# ceph osd dump|grep storage >> pool 6 'coldstorage' replicated size 3 min_size 1 crush_ruleset 0 >> object_hash rjenkins pg_num 512 pgp_num 512 last_change 216 lfor 216 >> flags >> hashpspool tiers 7 read_tier 7 write_tier 7 stripe_width 0 >> pool 7 'hotstorage' replicated size 3 min_size 1 crush_ruleset 1 >> object_hash rjenkins pg_num 128 pgp_num 128 last_change 228 flags >> hashpspool,incomplete_clones tier_of 6 cache_mode writeback >> target_bytes >> 100000000000 hit_set bloom{false_positive_probability: 0.05, target_size: >> 0, seed: 0} 3600s x6 stripe_width 0 >> ------------------------------------------------------------- >> rados bench -p coldstorage 300 write --no-cleanup >> Total time run: 302.207573 >> Total writes made: 4315 >> Write size: 4194304 >> Bandwidth (MB/sec): 57.113 >> >> Stddev Bandwidth: 23.9375 >> Max bandwidth (MB/sec): 104 >> Min bandwidth (MB/sec): 0 >> Average Latency: 1.1204 >> Stddev Latency: 0.717092 >> Max latency: 6.97288 >> Min latency: 0.158371 >> >> root@ubuntu:/# rados bench -p coldstorage 300 seq >> Total time run: 153.869741 >> Total reads made: 4315 >> Read size: 4194304 >> Bandwidth (MB/sec): 112.173 >> >> Average Latency: 0.570487 >> Max latency: 1.75137 >> Min latency: 0.039635 >> >> >> ceph.conf: >> -------------------------------------------- >> [global] >> fsid = 4ec1eb64-226c-4d90-8c5c-b6b6644be831 >> mon_initial_members = ceph2, ceph3, ceph4 >> mon_host = 10.**.**.241,10.**.**.242,10.**.**.243 >> auth_cluster_required = cephx >> auth_service_required = cephx >> auth_client_required = cephx >> filestore_xattr_use_omap = true >> osd_pool_default_size = 3 >> osd_pool_default_min_size = 1 >> auth_supported = cephx >> osd_journal_size = 10240 >> osd_mkfs_type = xfs >> osd crush update on start = false >> >> [client] >> rbd_cache = true >> rbd_cache_writethrough_until_flush = false >> rbd_cache_size = 33554432 >> rbd_cache_max_dirty = 25165824 >> rbd_cache_target_dirty = 16777216 >> rbd_cache_max_dirty_age = 1 >> rbd_cache_block_writes_upfront = false >> [osd] >> filestore_omap_header_cache_size = 40000 >> filestore_fd_cache_size = 40000 >> filestore_fiemap = true >> client_readahead_min = 2097152 >> client_readahead_max_bytes = 0 >> client_readahead_max_periods = 4 >> filestore_journal_writeahead = false >> filestore_max_sync_interval = 10 >> filestore_queue_max_ops = 500 >> filestore_queue_max_bytes = 1048576000 >> filestore_queue_committing_max_ops = 5000 >> filestore_queue_committing_max_bytes = 1048576000 >> keyvaluestore_queue_max_ops = 500 >> keyvaluestore_queue_max_bytes = 1048576000 >> journal_queue_max_ops = 30000 >> journal_queue_max_bytes = 3355443200 >> osd_op_threads = 20 >> osd_disk_threads = 8 >> filestore_op_threads = 4 >> osd_mount_options_xfs = >> rw,noatime,nobarrier,inode64,logbsize=256k,delaylog >> >> [mon] >> mon_osd_allow_primary_affinity=true >> >> -- >> 使用Opera的电子邮件客户端：http://www.opera.com/mail/ >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -----BEGIN PGP SIGNATURE----- Version: Mailvelope v1.3.3 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJWj/52CRDmVDuy+mK58QAAI1UP/jDBE95QirkgybKwOS5V fpCn+9tAk3psAkVEg3f9XdXtr2et0XSRiZ2Nce20Dj8OFsLcvNLuDXNEzwVH DLJTmQIvxyEFliXZyW+Tp1aumQylhlWMT/4zgc8H1YUxo0EBaYG8xXsItTBx DRHykhYPokn0lJxYBpqM6YyiTvAh1OsPL8fwDZaSan5uIaPD7VnbXmoYdkI3 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