Miao Xie <miaox <at> cn.fujitsu.com> writes: > > This patchset introduce extent buffer cache to btrfs. The basic idea > is to reduce the search time and the contentions of the extent buffer > lock by re-using the last search result. > > I ran stress.sh, xfstests and some other tools to test it, all of them > worked well. > > As a performance improvement patchset, of course we did performance test. > Because this patchset is to improve the b+ tree search, in other words, > it improves the performance of the metadata operations, we use file creation > test to measure it. So we ran 10 tasks, and all of them created 100000 files > in their own directories at the same time. As the result, we found this patchset > makes btrfs ~20% faster(98s -> 77s). > > we can pull this patchset from the URL > > git://github.com/miaoxie/linux-btrfs.git extent-buffer-cache > > Thanks > Miao > ---
I tested the patchset with aim7's fileserver test with 16 processes on RAM emulated SCSI btrfs file system. I got about 18% speedup in throughput. The workload is a mix of file copy, read, write and file sync. The contention on btrfs_tree_lock operation is reduced with the patchset, by about 8.4% of cpu cycles (from 48.3% to 39.9%). Miao, I can send you the detailed profile if you are interested. Thanks. Tim Chen -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
