2009/10/1 Kazuya Mio <k-mio@xxxxxxxxxxxxx>: > 2009/10/01 3:28, Greg Freemyer wrote:: >> 2009/9/30 Kazuya Mio <k-mio@xxxxxxxxxxxxx>: >>> e4defrag with -c option outputs "ratio" that means the levels of >>> fragmentation. However, it's difficult for users to understand, so we will >>> use blocks per extent instead of ratio. >>> >>> Before: >>> # e4defrag -c /mnt/mp1/file >>> <File> now/best ratio >>> /mnt/mp1/file 14/1 0.01% >>> >>> Total/best extents 14/1 >>> Fragmentation ratio 0.01% >>> Fragmentation score 0.10 >>> [0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag] >>> This file(/mnt/mp1/file) does not need defragmentation. >>> Done. >>> >>> After: >>> # e4defrag -c /mnt/mp1/file >>> <File> now/best blk/ext >>> /mnt/mp1/file 14/1 7142 >>> >>> Total/best extents 14/1 >>> Average blocks per extent 7142 >>> Fragmentation score 0 >>> [0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag] >>> This file(/mnt/mp1/file) does not need defragmentation. >>> Done. >> >> RFC >> >> If we are going go that far (which I like), how about adding the avg >> extent size in bytes. (ie. 7142 * blocksize I assume). >> >> Also a note about the max blocks / extent might be good. >> >> ie. Add a more or less hard coded line >> Ext4 max blocks per extent 32,768 (128MiB) > > Your ideas sound good. How about the following output image? > > # e4defrag -c /mnt/mp1/file > <File> now/best KB/ext > /mnt/mp1/file 14/1 4000 > > Total/best extents 14/1 > Min bytes per extent 1024 KB > Max bytes per extent 20489 KB > Average bytes per extent 4000 KB > Fragmentation score 0 > [0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag] > This file(/mnt/mp1/file) does not need defragmentation. > Done. > > Regards, > > Kazuya Mio I was thinking more of the theoretical max bytes per extent, not the largest extent found in the actual file. I say this because most users of e4defrag won't know what perfection is, so they won't know if and when they have come close if they don't know what the ultimate goal is. Specifically, think of a admin hosting a few virtual machines where the virtual disks are ext4 files. They could easily be 100's of GB so they may think even 128MB / extent can be improved on, even though they have already achieved the theoretical max. Greg -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
