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I'd run such a tool on prod in "advice mode". It should suggest the tweaks, explaining the reasoning behind them, and listing the actions necessary to implement

by nine_k 2y ago

I'd run such a tool on prod in "advice mode". It should suggest the tweaks, explaining the reasoning behind them, and listing the actions necessary to implement them. Then humans would decide if they want to implement that as is, partly, modified, or not at all.

sgarland 2y ago
Fair point, though I didn’t see any such option with this tool.
- nine_k 2y ago
  It's developed in the open; we can create Github issue. Actually https://github.com/oracle/bpftune/issues/99 https://github.com/oracle/bpftune/issues/99
  - westurner 2y ago
    In the existing issue, we can link to the code and docs that would need to be understood and changed: usage, main() https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/bpftune.c#L280 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d... - [ ] CLI opts: --pretend-allow <tuner> or --log-only-allow <tuner> or [...] Probably relevant function headers in libbpftune.c: bpftune_sysctl_write( bpftuner_tunable_sysctl_write( bpftune_module_load( static void bpftuner_scenario_log(struct bpftuner *tuner, unsigned int tunable, ; https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/libbpftune.c#L716 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d... https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/libbpftune.c#L1047 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d...
    - westurner 2y ago
      Here's that, though this is dnvted to -1? https://github.com/oracle/bpftune/issues/99#issuecomment-2483618905 https://github.com/oracle/bpftune/issues/99#issuecomment-248... Ideally this tool could passively monitor and recommend instead of changing settings in production which could lead to loss of availability by feedback failure; -R / --rollback actively changes settings, which could be queued or logged as idk json or json-ld messages.
bink 2y ago
I agree. There's very little need to have a tool automatically changing complex kernel settings on the fly unless your infrastructure is undergoing dramatic changes in load and behavior on a daily basis, which seems unlikely for a modern server.

by nine_k 2y ago

sgarland 2y ago

Fair point, though I didn’t see any such option with this tool.

nine_k 2y ago
It's developed in the open; we can create Github issue. Actually https://github.com/oracle/bpftune/issues/99 https://github.com/oracle/bpftune/issues/99
- westurner 2y ago
  In the existing issue, we can link to the code and docs that would need to be understood and changed: usage, main() https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/bpftune.c#L280 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d... - [ ] CLI opts: --pretend-allow <tuner> or --log-only-allow <tuner> or [...] Probably relevant function headers in libbpftune.c: bpftune_sysctl_write( bpftuner_tunable_sysctl_write( bpftune_module_load( static void bpftuner_scenario_log(struct bpftuner *tuner, unsigned int tunable, ; https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/libbpftune.c#L716 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d... https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d889e3a60de6c12feb76/src/libbpftune.c#L1047 https://github.com/oracle/bpftune/blob/6a50f5ff619caeea6f04d...
  - westurner 2y ago
    Here's that, though this is dnvted to -1? https://github.com/oracle/bpftune/issues/99#issuecomment-2483618905 https://github.com/oracle/bpftune/issues/99#issuecomment-248... Ideally this tool could passively monitor and recommend instead of changing settings in production which could lead to loss of availability by feedback failure; -R / --rollback actively changes settings, which could be queued or logged as idk json or json-ld messages.

bink 2y ago

I agree. There's very little need to have a tool automatically changing complex kernel settings on the fly unless your infrastructure is undergoing dramatic changes in load and behavior on a daily basis, which seems unlikely for a modern server.