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在 Ubuntu 24.04 和 26.04 上使用 NetApp iSCSI LUN 时的性能回归

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适用于

  • Ubuntu Linux 24.04, 26.04
  • iSCSI 多路径环境
  • Kubernetes(已使用 v1.32.8 进行测试)
  • Trident 25.06

问题

  • 从 Ubuntu 22.04(内核 5.15)升级到 Ubuntu 24.04/26.04(内核 6.8/7.0/7.1)后,通过 Trident CSI 经由 iSCSI 访问的 NetApp LUN 上的磁盘 I/O 和带宽性能显著降低。
  • 这发生在相同的硬件、网络和存储后端条件下。
  • 通过命令 iscsiadm -m session -P 3 协商的 iSCSI 会话参数:

MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 65536
FirstBurstLength: 65536
MaxBurstLength: 1048576
ImmediateData: Yes
InitialR2T: Yes
MaxOutstandingR2T: 1

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