[LU-12533] Improve readahead RPC issuance for large window sizes Created: 10/Jul/19 Updated: 21/Nov/19 Resolved: 16/Sep/19 |
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| Status: | Resolved |
| Project: | Lustre |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | Lustre 2.13.0, Lustre 2.12.4 |
| Type: | Improvement | Priority: | Minor |
| Reporter: | Patrick Farrell (Inactive) | Assignee: | Patrick Farrell (Inactive) |
| Resolution: | Fixed | Votes: | 0 |
| Labels: | None | ||
| Issue Links: |
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| Rank (Obsolete): | 9223372036854775807 | ||||
| Description |
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Currently, when the Lustre readahead window crosses a stripe boundary, the lov_io_submit code stops there and sends an RPC. This means that for striped files & large readahead windows, we will send RPCs sized, at maximum, stripe_size. This is unnecessary - If a readahead window hits the same stripe more than once, we can take advantage of that fact and submit larger RPCs. This is particularly apparent in strided readahead. |
| Comments |
| Comment by Gerrit Updater [ 10/Jul/19 ] |
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Patrick Farrell (pfarrell@whamcloud.com) uploaded a new patch: https://review.whamcloud.com/35458 |
| Comment by Gerrit Updater [ 16/Sep/19 ] |
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Oleg Drokin (green@whamcloud.com) merged in patch https://review.whamcloud.com/35458/ |
| Comment by Peter Jones [ 16/Sep/19 ] |
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Landed for 2.13 |
| Comment by Gerrit Updater [ 01/Oct/19 ] |
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Minh Diep (mdiep@whamcloud.com) uploaded a new patch: https://review.whamcloud.com/36342 |
| Comment by Gerrit Updater [ 21/Nov/19 ] |
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Oleg Drokin (green@whamcloud.com) merged in patch https://review.whamcloud.com/36342/ |