File system for nginx cache?

Question

Nginx

There is nginx + ssi, there is a cache. There are millions of 10-15 kb files in the cache.
The cache is located on the ssd - helps to avoid the problem with parallel requests.
I wonder: what is the most optimal FS for these tasks?
Indeed, in my case, a lot of overhead costs are spent on metadata.
Of course with noatime, nodiratime.
Tried to find the answer in search engines, but there is none on the surface.
I am using linux debian stable.
FS ext2, I abandoned ext3, because. considered logging unnecessary.
Besides, ext2 is faster than ext3, and I'm afraid of ext4.
There is also Btrfs, but I need the most primitive functionality.
Roughly speaking, key-value storage on disk is possible without ACL at all. Btrfs too I am afraid.
The load problem can be solved by adding a frontend.
But, I suspect that the FS can be greatly optimized.

Answer 1

reiserfs had a lot of optimizations over a big pile of little things, check out reiser4

Answer 2

ext2 necessarily with dir_index(Use hashed b-trees to speed up lookups in large directories) or XFS(I think it will be more productive)

Answer 3

Was it possible to store the nginx cache in memcache?

Answer 4

in your case, the best FS is the simplest FS, so out of the mentioned ext2 is the best choice ;)