Solaris RDS Performance Impacted by kmem_flags Settting after SuperCluster Patched to Q2 2019 QFSDP (11.4)
(Doc ID 2611945.1)
Last updated on MARCH 26, 2021
Applies to:Solaris Operating System - Version 11.4 and later
Information in this document applies to any platform.
An M7-8 SuperCluster exerienced a serious performance degradation after patching with the 2019 Q2 QFSDP (Quarterly Full Stack Download Patch).
The patch upgraded the Solaris OS from 188.8.131.52.0 to 184.108.40.206.0.
When under a database load, latency and throughput of RDS traffic was severely impacted.
These are qperf values - using the qperf rds_lat and rds_bw tests, while under a substantial database workload:
While under DB workload - with kmem_flags=0x7
Patch/OS version RDS bandwidth RDS latency
Q1 2019 220.127.116.11.0 151 MBytes/sec 65.9 microseconds
Q2 2019 18.104.22.168.0 691 KBytes/sec 3.86 milliseconds
We can see that the Q1 (22.214.171.124.0) performance is not what is generally considered good, but the Q2 (126.96.36.199.0) perfromance is far behind.
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