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I was searching via Google and found nothing... ext4 has 3 journalling modes. They have different performances. But performances of what - reading and writing or writing only? Is reading speed of writeback and ordered modes the same?
I know files have access time and date which changes after you read the file. But does journalling mode affect it?
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This difference of read speed is with patch, not original ext4 driver. But thanks.
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that's part of the kernel code now, you can disable the journal if you want
the "default" column is with ordered, writeback will be slightly faster, and then without a journal at all is faster
as long as you use noatime, the read speed of each is the same
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Although this is aimed at ext3 there's a decent description of the 3 data=? in this paper http://www.sun.com/software/whitepapers … rmance.pdf
Some performance benchmarks near the end iirc.
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