Messages in this thread | | | Date | Mon, 14 Jun 1999 22:18:35 +0200 | From | Jan Kara <> | Subject | Re: Speeding up fsck 2 times |
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> >>>>> "Pavel" == Pavel Machek <pavel@bug.ucw.cz> writes: > > I do not know if I should attempt official kernel integration. I > > probably can make it per mount option pretty easily. > We just have to come up with the worst case and a benchmark for it so we > can try it on various configs. Is linear access to a big > file the worst case ? Isn't there something worse ? Worst case would be reading two blocks which are on the "reference block boundary" - one block referenced as last one in the block so for next one we have to read in reference block which would mean seek - read block - seek - read data block instead of current read block - read data block. But this is not very probable case so the worst reasonable case would be linear reading (long at least a few MB) of file large enough in the part where are triple indirects... But as we are going to loose only each 256KB when using 1KB blocks I don't think we will loose more than a few percents (my personal estimation is <5%).
Honza.
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