On Sun, 7 May 2006, Theodore Tso wrote: >> > If there are 233338 objects, then the average wasted space due to > internal fragmentation is 233338 * 2k, or 466676 kilobytes, or only > 36% of the wasted space. That's not necessarily true. That assumes a randomly distributed filesize. File sizes are _not_ random, and in particular if you have the distribution leaning towards <2kB being common, you can actually get >50% fragmentation. Btw, I hit this when some people argued that the page size should be made 64kB. The above (incorrect) logic implies that you waste 32kB on average per file. That's not true, if a large fraction of your files are small, in which case you may actually be wastign closer to 60kB on average from using a big page-size, because about half of the kernel files are actually smaller than 4kB (or something. I forget the exact statistics, I did them with a script at some point). Anyway, with inode overhead and a lot of objects being just a couple of hundred bytes, I think I estimated at some point that you actually lost closer to 3kB per object. Many of the objects actually end up being smaller than the inode they end up allocating ;( Linus - : send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html