为何同一个分区使用不同分区格式，显示容量大小不同？

A few weeks ago I posted a patch for discussion that allowed ext4 to run
without a journal. Since that time I've integrated the excellent
comments from Andreas and fixed several serious bugs. We're currently
running with this patch and generating some performance numbers against
both ext2 (with backported reservations code) and ext4 with and without
a journal. It just so happens that running without a journal is
slightly faster for most everything.

We did
iozone -T -t 4 s 2g -r 256k -T -I -i0 -i1 -i2

which creates 4 threads, each of which create and do reads and writes on
a 2G file, with a buffer size of 256K, using O_DIRECT for all file opens
to bypass the page cache. Results:

 ext2 ext4, default ext4, no journal
 initial writes 13.0 MB/s 15.4 MB/s 15.7 MB/s
 rewrites 13.1 MB/s 15.6 MB/s 15.9 MB/s
 reads 15.2 MB/s 16.9 MB/s 17.2 MB/s
 re-reads 15.3 MB/s 16.9 MB/s 17.2 MB/s
 random readers 5.6 MB/s 5.6 MB/s 5.7 MB/s
 random writers 5.1 MB/s 5.3 MB/s 5.4 MB/s

So it seems that, so far, this was a useful exercise.