Thanks for trying out a mainline build.
Since you're experiencing this performance regression with a recent
mainline Linux kernel, I would try submitting a bug report to upstream
Linux. The maintainers of the iscsi_tcp driver would have the most
expertise in thoroughly diagnosing and resolving the regression in
performance you're seeing compared to older kernels.
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/2157924
Title:
iscsi_tcp 40-50% sequential read performance regression (5.15 vs
6.8/7.0) due to release_sock serialization bottleneck
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