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pagecache invalidation is quite expensive:

pagecache enabled:

ost  1 sz 268435456K rsz 16384K obj   16 thr   64 write 5094.16 [2287.82, 6383.46] read 5295.85 [5039.42, 5567.47]

pagecache disabled:

ost  1 sz 268435456K rsz 16384K obj   16 thr   64 write 4460.22 [3615.59, 5151.63] read 5218.00 [4847.41, 5551.34]

we do already have a mechanism to bypass pagecache in place, just need to use that properly.

is duplicated by

LU-11341 Do not use pagecache for I/O

LU-12346 ladvise willread should work even if OSD cache is disabled

is related to

LU-12016 sanity: test_156 Error: ''IN CACHE: before: 8255, after: 8258''

LU-13680 large allocations in osd_bufs_get() failing

LU-12179 allocate continuous pages when disabled page caches

is related to

LU-410 Performance concern with Shrink file_max_cache_size to alleviate the memory pressure of OST patch for LU-15

LU-11347 Do not use pagecache for SSD I/O when read/write cache are disabled

(2 is related to )