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| author | Sage Weil <sage@inktank.com> | 2013-09-27 13:08:37 -0700 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-09-27 13:08:37 -0700 |
| commit | 8c810fd90ce090a85ad326b87f60222108a1fba2 (patch) | |
| tree | 4aff9f75ebf60c9d3c72c299aa4c96025f8f41aa | |
| parent | beb366302a125dd422c4f092b12eb541cb3bc788 (diff) | |
| download | ceph-8c810fd90ce090a85ad326b87f60222108a1fba2.tar.gz | |
hack: falloc 4mb rbd data objects
Lets' see if this improves rbd performance vs fragmentation behavior
| -rw-r--r-- | src/os/FileStore.cc | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/src/os/FileStore.cc b/src/os/FileStore.cc index 7418039ece6..95dfe672207 100644 --- a/src/os/FileStore.cc +++ b/src/os/FileStore.cc @@ -26,6 +26,7 @@ #if defined(__linux__) #include <linux/fs.h> #include <syscall.h> +#include <linux/falloc.h> #endif #include <iostream> @@ -3044,7 +3045,7 @@ int FileStore::_write(coll_t cid, const hobject_t& oid, << cpp_strerror(r) << dendl; goto out; } - + // seek actual = ::lseek64(**fd, offset, SEEK_SET); if (actual < 0) { @@ -3060,6 +3061,20 @@ int FileStore::_write(coll_t cid, const hobject_t& oid, goto out; } +#ifdef CEPH_HAVE_FALLOCATE +# if !defined(DARWIN) && !defined(__FreeBSD__) + // hack: fallocate rbd? + if (oid.oid.name.find("rb.") == 0) { + struct stat st; + ::fstat(**fd, &st); + if (st.st_size == 0 && !(offset == 0 && len == 4194304)) { + dout(20) << "write fallocating to 4MB" << dendl; + fallocate(**fd, FALLOC_FL_KEEP_SIZE, 0, 4194304); + } + } +# endif +#endif + // write r = bl.write_fd(**fd); if (r == 0) |