Details
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Improvement
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Resolution: Fixed
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Minor
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None
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None
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9223372036854775807
Description
When doing readahead, we see an amazing amount of time (~5%) just looking up the page index from the lov layer.
a
- 84.42% 0.34% ior [kernel.kallsyms] [k] ll_readpage a
- 84.08% ll_readpage a
- 82.68% ll_io_read_page a
+ 68.53% ll_readahead.isra.27 a
- 14.14% cl_io_submit_rw a
- 13.40% lov_io_submit a
- 8.24% lov_page_index a
5.56% cl_page_at
This never changes once a page is created, so we can just store it at the top layer.
Attachments
Activity
| Link | New: This issue is related to DDN-867 [ DDN-867 ] |
| Fix Version/s | New: Lustre 2.13.0 [ 14290 ] | |
| Resolution | New: Fixed [ 1 ] | |
| Status | Original: Reopened [ 4 ] | New: Resolved [ 5 ] |
| Comment |
[ Patrick Farrell (pfarrell@whamcloud.com) uploaded a new patch: https://review.whamcloud.com/36060 Subject: Project: fs/lustre-wc Branch: io500 Current Patch Set: 1 Commit: 3c13394ed4e6014bb0b5ac238f42e8ed1f8c242a ] |
| Resolution | Original: Won't Do [ 10200 ] | |
| Status | Original: Resolved [ 5 ] | New: Reopened [ 4 ] |
| Comment | [ Aw, crap. This is due to a bug. Nevermind... ] |
| Comment | [ Bug in another, not landed, patch. ] |
| Resolution | New: Won't Do [ 10200 ] | |
| Status | Original: Open [ 1 ] | New: Resolved [ 5 ] |