On Thu, Sep 30, 2010 at 3:15 AM, Sander <[email protected]> wrote: > Yuehai Xu wrote (ao): >> So, is it a bottleneck in the case of SSD since the cost for over >> write is very high? For every write, I think the superblocks should be >> overwritten, it might be much more frequent than other common blocks >> in SSD, even though SSD will do wear leveling inside by its FTL. > > The FTL will make sure the write cycles are evenly divided among the > physical blocks, regardless of how often you overwrite a single spot on > the fs. > >> What I current know is that for Intel x25-V SSD, the write throughput >> of BTRFS is almost 80% less than the one of EXT3 in the case of >> PostMark. This really confuses me. > > Can you show the script you use to test this, provide some info > regarding your setup, and show the numbers you see?
My test case for PostMark is: set file size 9216 15360 (file size from 9216 bytes to 15360 bytes) set number 50000(file number is 50000) write throughput(MB/s) for different file systems in Intel SSD X25-V: EXT3: 28.09 NILFS2: 10 BTRFS: 17.35 EXT4: 31.04 XFS: 11.56 REISERFS: 28.09 EXT2: 15.94 Thanks, Yuehai > > Sander > > -- > Humilis IT Services and Solutions > http://www.humilis.net > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
