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Diffstat (limited to 'doc/godebug.md')
| -rw-r--r-- | doc/godebug.md | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/godebug.md b/doc/godebug.md index d26555503e..4b71e4d469 100644 --- a/doc/godebug.md +++ b/doc/godebug.md @@ -134,6 +134,19 @@ The default is tlsmaxrsasize=8192, limiting RSA to 8192-bit keys. To avoid denial of service attacks, this setting and default was backported to Go 1.19.13, Go 1.20.8, and Go 1.21.1. +Go 1.22 changed how the runtime interacts with transparent huge pages on Linux. +In particular, a common default Linux kernel configuration can result in +significant memory overheads, and Go 1.22 no longer works around this default. +To work around this issue without adjusting kernel settings, transparent huge +pages can be disabled for Go memory with the +[`disablethp` setting](/pkg/runtime#hdr-Environment_Variable). +This behavior was backported to Go 1.21.1, but the setting is only available +starting with Go 1.21.6. +This setting may be removed in a future release, and users impacted by this issue +should adjust their Linux configuration according to the recommendations in the +[GC guide](/doc/gc-guide#Linux_transparent_huge_pages), or switch to a Linux +distribution that disables transparent huge pages altogether. + ### Go 1.21 Go 1.21 made it a run-time error to call `panic` with a nil interface value, |