Re: Use of kmalloc vs vmalloc in ext4?

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P.S.   What sort of flex_bg size are you using?

          EXT4-fs: not enough memory for 8198 flex groups
          EXT4-fs: unable to initialize flex_bg meta info!

Modern e2fsprogs default to using 16 block groups per flex_bg, which
means 8198 flex groups is a little over 16 TB --- which the mainline
e2fsprogs doesn't support yet.  You wouldn't be using a smaller
flex_bg size for some reason, are you?

If so, can you say something about why?  I've been actually thinking
that we might want to bump up the flex_bg size slight more, but it
appears you're using something smaller; was this deliberate.

	       	     	       		    - Ted
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