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Set a lower default MaxMemInQueues value

The default MaxMemInQueues value of 0.75*RAM assumes:

  • there is one tor instance per machine, and
  • MaxMemInQueues covers most queue memory.

If we instead assumed:

  • two tor instances, and
  • MaxMemInQueues covers half of queue memorym this would make Tor more resilient to attacks.

To do this, we should set MaxMemInQueues to 0.2*RAM, at least if we have a lot of RAM (like 4-8GB or more).

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