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MQSeries.net Forum Index » General IBM MQ Support » Swappiness & Net Mem

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bobbee
PostPosted: Tue Nov 11, 2025 3:46 am    Post subject: Swappiness & Net Mem Reply with quote

Knight

Joined: 20 Sep 2001
Posts: 547
Location: Tampa
Are there recommended settings for Swappiness & Net Mem for MQ.

Swappiness
- REL 8 default is 60
- REL 8 also really started pushing cgroups, so it?s no longer enough to just set swappiness
- RedHat recommends 60 because SSD?s have become blazingly fast
- SSD speed isn?t our issue though, any data written to disk is synchronously replicated which kills us for SWAP.

Net mem
- Using the default net memory settings means that max and default are the same
- This severely limits TCP window scaling (typically to 65k max)
- Increasing the max allows the window to grow as needed to fit the data flow
- Small windows limit how much data can be received before the sender needs to stop and wait for the other side to catch up.
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