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Type: Improvement
Resolution: Done
Priority: Major - P3
Fix Version/s: 3.0.0-rc6
Affects Version/s: 2.8.0-rc3
Component/s: Admin, Performance
Labels:
None

Backwards Compatibility:
Fully Compatible
Confidence Status:
None
Work Order:
3
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

We currently check certain system parameters at start-up including high read-ahead and transparent huge pages.

It turns out even if THP are disabled (enabled set to [never]) if defrag is "always" then it impacts mongod when Linux defrags the pages. We should extend the check and the warning to /sys/kernel/mm/transparent_hugepage/defrag

depends on

SERVER-13482 mongod could warn user if OS transparent huge pages feature is on

Closed

is related to

SERVER-16269 WiredTiger blocks queries and updates for many seconds.

Closed

SERVER-17522 THP startup warnings can become stale

Closed

related to

SERVER-17036 db.runCommand({startupWarnings:1}) includes spurious line

Closed

SERVER-27588 Warning to disable defrag of transparent_hugepages when thp is disabled

Closed

links to

MongoDB Manual - Production Notes

(1 links to)

Assignee:: Benety Goh
Reporter:: Asya Kamsky
Participants:: Asya Kamsky, Benety Goh, Daniel Pasette, Githook User
Votes:: 0 Vote for this issue
Watchers:: 8 Start watching this issue

Created:: Dec 23 2014 03:42:28 PM UTC
Updated:: Sep 05 2018 02:34:44 PM UTC
Resolved:: Jan 15 2015 06:53:57 PM UTC

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