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34 lines
1.2 KiB
34 lines
1.2 KiB
commit 027e6efd2b432232562d726f14702f79792b38cb |
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Author: Eric Sandeen <sandeen@sandeen.net> |
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Date: Mon May 30 10:35:56 2016 +1000 |
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xfs_db: defang frag command |
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Too many people freak out about this fictitious "fragmentation |
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factor." As shown in the fact, it is largely meaningless, because |
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the number approaches 100% extremely quickly for just a few |
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extents per file. |
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I thought about removing it altogether, but perhaps a note |
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about its uselessness, and a more soothing metric (avg extents |
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per file) might be useful. |
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Signed-off-by: Eric Sandeen <sandeen@redhat.com> |
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Reviewed-by: Christoph Hellwig <hch@lst.de> |
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Signed-off-by: Dave Chinner <david@fromorbit.com> |
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Index: xfsprogs-4.5.0/db/frag.c |
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=================================================================== |
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--- xfsprogs-4.5.0.orig/db/frag.c |
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+++ xfsprogs-4.5.0/db/frag.c |
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@@ -172,6 +172,10 @@ frag_f( |
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answer = 0.0; |
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dbprintf(_("actual %llu, ideal %llu, fragmentation factor %.2f%%\n"), |
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extcount_actual, extcount_ideal, answer); |
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+ dbprintf(_("Note, this number is largely meaningless.\n")); |
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+ answer = (double)extcount_actual / (double)extcount_ideal; |
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+ dbprintf(_("Files on this filesystem average %.2f extents per file\n"), |
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+ answer); |
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return 0; |
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} |
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