Theodore Tso wrote:
...
> Here's the output on my root filesystem (which has been in use since
> February):
>
> Device: /dev/ssd/root
> Blocksize: 4096 bytes
> Total blocks: 18350080
> Free blocks: 10774142 (58.7%)
>
> Chunksize: 1048576 bytes (256 blocks)
> Total chunks: 71681
> Free chunks: 21792 (30.4%)
>
> Min free chunk: 4 KB
> Max free chunk: 568232 KB
> Avg free chunk: 184 KB
>
> HISTOGRAM OF FREE CHUNK SIZES:
> Chunk Size Range : Free chunks
> 4K... 8K- : 35005
> 8K... 16K- : 33639
> 16K... 32K- : 31419
> 32K... 64K- : 33953
> 64K... 128K- : 26397
> 128K... 256K- : 7314
> 256K... 512K- : 1855
> 512K... 1024K- : 1612
> 1M... 2M- : 1160
> 2M... 4M- : 567
> 4M... 8M- : 303
> 8M... 16M- : 106
> 16M... 32M- : 40
> 32M... 64M- : 51
> 64M... 128M- : 123
> 128M... 256M- : 8
> 512M... 1024M- : 1
>
> Yeah.... pretty fragmented. :-(
>
Just for comparison, here's a 30G xfs root that has run for a year or
two, currently about 70% full:
xfs_db> freesp -s
from to extents blocks pct
1 1 1849 1849 0.08
2 3 1383 3293 0.14
4 7 1034 5429 0.23
8 15 1061 12260 0.53
16 31 641 13261 0.57
32 63 355 15601 0.67
64 127 221 19940 0.86
128 255 195 35841 1.54
256 511 173 63066 2.71
512 1023 122 89824 3.86
1024 2047 51 70032 3.01
2048 4095 22 60982 2.62
4096 8191 20 116580 5.01
8192 16383 10 109896 4.72
16384 32767 7 152026 6.53
32768 65535 4 206283 8.87
65536 131071 3 285744 12.28
262144 524287 1 509811 21.91
524288 1048575 1 554838 23.85
total free extents 7153
total free blocks 2326556
average free extent size 325.256
from...to units are in 4k blocks.
Maybe the fancy ext4 defragger will have a good second use case in
cleaning up some of that freespace fragmentation.
-Eric
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