Sequential read / write speed
UPDATE 2012-07-24: reviewing my IOMeter profile for another analysis, I found a typo on the 128 KB sequential test. That profile incorrectly used 4 KB blocks instead of 128 KB ones. This means that this page, while originally intended to measure 128 KB sequential speed, is really about 4 KB sequential performance. I will update the review with correct data as soon as possibile. Sorry for the error.
UPDATE 2012-08-23: I have finally updated the page with the correct 128 KB sequential read/write test (if you continue to see the old values, press F5 to refresh).
While random I/O speed is crucial for system responsiveness and overall performance, sequential speed is important also: often we are dealing with big files, on which read / write operations are done with bigger block sizes.
So, how the contenders fare with 128 KB blocks size under IOMeter? First, reads:
EXT3 and EXT4 are the leaders here, shortly followed by XFS. BTRFS is the slower – by far.
BTRFS write performance are even worse! EXT3 and EXT4 remain on the top, with XFS a bit behind.