[LU-12071] bypass pagecache for large files

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.14.0
• Type: Improvement
• Priority: Minor
• Reporter: Alex Zhuravlev
• Assignee: Alex Zhuravlev
• Resolution: Fixed

Description

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.

Issue Links

• is duplicated by: LU-11341 Do not use pagecache for I/O
• is duplicated by: LU-12346 ladvise willread should work even if ...
• is related to: LU-410 Performance concern with Shrink file_...
• is related to: LU-11347 Do not use pagecache for SSD I/O when...
• is related to: LU-12016 sanity: test_156 Error: ''IN CACHE: b...
• is related to: LU-13680 large allocations in osd_bufs_get() f...
• is related to: LU-12179 allocate continuous pages when disabl...

Comments

[Gerrit Updater]

Alex Zhuravlev ([e-mail]) uploaded a new patch: https://review.whamcloud.com/34422
Subject: LU-12071 osd-ldiskfs: bypass pagecache if requested
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 4652ad0b0d65b616b11c27829c221521003c623b

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/34422/
Subject: LU-12071 osd-ldiskfs: bypass pagecache if requested
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 3043c6f18964b0cc843b2e7866756a1d1ddd61e3

[Peter Jones]

Landed for 2.14