Hi! The preamble: recently I had to force-change my configuration (the old laptop was stolen). What I have now is a combination of a tiny 16 GiB SSD and a huge 1 TiB HDD. ...So I've placed my /home on HDD. Partition size is 800 GiB, formatting options are "create=ccreg40,compress=gzip1,compressMode=latt" and I have a few questions. 1. What is the recommended compression mode? More specifically, what is the default "conv" mode? What is its purpose, why is it the default? I'm asking, because I wasn't able to understand its purpose from code, and the code itself looks hackish in some places (hardcoded fallback to extent-only files, hardcoded policy, hardcoded fallback to "latt" in many cases, etc). 2. The mount time of a 800-GiB partition is >20 seconds. And with dont_load_bitmap it's around 1-2 seconds. Why so much? Why other filesystems have drastically less mount times? If they have an equivalent of dont_load_bitmap enabled by default, why don't we do it? 3. Given a directory tree with ~20k files of total size around 20 GiB, its removal takes forever. From strace I see that a single unlink takes ~1 second. Again, why so much? Is it related to my choice of "latt" compression mode over the default "conv"? 3a. I can reproduce the "directory not empty" bug :) Interestingly, it is always the same directory under the aforementioned huge hierarchy. (I've done the unpack-remove cycle a few times.) Thanks, -- Ivan Shapovalov / intelfx /
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