Hi Guys, I'm having the same problem as Oliver with 0.67.2. CPU usage is around double that of the 0.61.8 OSD's in the same cluster which appears to be causing the performance decrease.
I did a perf comparison (not sure if I did it right but it seems ok). Both hosts are the same spec running Ubuntu 12.04.1 (3.2 kernel), journal and osd data is on an SSD, OSD's are in the same pool with the same weight and the perf tests were run at the same time on a realworld load consisting of RBD traffic only. Dumpling - Events: 332K cycles 17.93% ceph-osd libc-2.15.so [.] 0x15d523 17.03% ceph-osd ceph-osd [.] 0x5c2897 4.66% ceph-osd ceph-osd [.] leveldb::InternalKeyComparator::Compare(leveldb::Slice const&, level 3.46% ceph-osd ceph-osd [.] leveldb::Block::Iter::Next() 2.70% ceph-osd libstdc++.so.6.0.16 [.] std::string::_M_mutate(unsigned long, unsigned long, unsigned long) 2.60% ceph-osd ceph-osd [.] PGLog::check() 2.57% ceph-osd [kernel.kallsyms] [k] __ticket_spin_lock 2.49% ceph-osd ceph-osd [.] ceph_crc32c_le_intel 1.93% ceph-osd libsnappy.so.1.1.2 [.] snappy::RawUncompress(snappy::Source*, char*) 1.53% ceph-osd libstdc++.so.6.0.16 [.] std::string::append(char const*, unsigned long) 1.47% ceph-osd libtcmalloc.so.0.1.0 [.] operator new(unsigned long) 1.33% ceph-osd [kernel.kallsyms] [k] copy_user_generic_string 0.98% ceph-osd libtcmalloc.so.0.1.0 [.] operator delete(void*) 0.90% ceph-osd libstdc++.so.6.0.16 [.] std::string::assign(char const*, unsigned long) 0.75% ceph-osd libstdc++.so.6.0.16 [.] std::string::_M_replace_safe(unsigned long, unsigned long, char cons 0.58% ceph-osd [kernel.kallsyms] [k] wait_sb_inodes 0.55% ceph-osd ceph-osd [.] leveldb::Block::Iter::Valid() const 0.51% ceph-osd libtcmalloc.so.0.1.0 [.] tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache:: 0.50% ceph-osd libtcmalloc.so.0.1.0 [.] tcmalloc::CentralFreeList::FetchFromSpans() 0.47% ceph-osd libstdc++.so.6.0.16 [.] 0x9ebc8 0.46% ceph-osd libc-2.15.so [.] vfprintf 0.45% ceph-osd [kernel.kallsyms] [k] find_busiest_group 0.45% ceph-osd libstdc++.so.6.0.16 [.] std::string::resize(unsigned long, char) 0.43% ceph-osd libpthread-2.15.so [.] pthread_mutex_unlock 0.41% ceph-osd [kernel.kallsyms] [k] iput_final 0.40% ceph-osd ceph-osd [.] leveldb::Block::Iter::Seek(leveldb::Slice const&) 0.39% ceph-osd libc-2.15.so [.] _IO_vfscanf 0.39% ceph-osd ceph-osd [.] leveldb::Block::Iter::key() const 0.39% ceph-osd libtcmalloc.so.0.1.0 [.] tcmalloc::CentralFreeList::ReleaseToSpans(void*) 0.37% ceph-osd libstdc++.so.6.0.16 [.] std::basic_ostream<char, std::char_traits<char> >& std::__ostream_in Cuttlefish - Events: 160K cycles 7.53% ceph-osd [kernel.kallsyms] [k] __ticket_spin_lock 6.26% ceph-osd libc-2.15.so [.] 0x89115 3.06% ceph-osd ceph-osd [.] ceph_crc32c_le 2.66% ceph-osd libtcmalloc.so.0.1.0 [.] operator new(unsigned long) 2.46% ceph-osd [kernel.kallsyms] [k] find_busiest_group 1.80% ceph-osd libtcmalloc.so.0.1.0 [.] operator delete(void*) 1.42% ceph-osd [kernel.kallsyms] [k] try_to_wake_up 1.27% ceph-osd ceph-osd [.] 0x531fb6 1.21% ceph-osd libstdc++.so.6.0.16 [.] 0x9ebc8 1.14% ceph-osd [kernel.kallsyms] [k] wait_sb_inodes 1.02% ceph-osd libc-2.15.so [.] _IO_vfscanf 1.01% ceph-osd [kernel.kallsyms] [k] update_shares 0.98% ceph-osd [kernel.kallsyms] [k] filemap_fdatawait_range 0.90% ceph-osd libstdc++.so.6.0.16 [.] std::basic_ostream<char, std::char_traits<char> >& std 0.89% ceph-osd [kernel.kallsyms] [k] iput_final 0.79% ceph-osd libstdc++.so.6.0.16 [.] std::basic_string<char, std::char_traits<char>, std::a 0.79% ceph-osd [kernel.kallsyms] [k] copy_user_generic_string 0.78% ceph-osd libc-2.15.so [.] vfprintf 0.70% ceph-osd libtcmalloc.so.0.1.0 [.] tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc: 0.69% ceph-osd [kernel.kallsyms] [k] __d_lookup_rcu 0.69% ceph-osd libtcmalloc.so.0.1.0 [.] tcmalloc::CentralFreeList::FetchFromSpans() 0.66% ceph-osd [kernel.kallsyms] [k] igrab 0.63% ceph-osd [kernel.kallsyms] [k] update_cfs_load 0.63% ceph-osd [kernel.kallsyms] [k] link_path_walk If you'd like some more tests run just let me know, more than happy to help Thanks -Matt _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
