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Workaround for rngd cpu overload on rpi #714

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Workaround for rngd cpu overload on rpi #714

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7 changes: 7 additions & 0 deletions src/installation/guides/arm-devices/platforms.md
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Expand Up @@ -45,6 +45,13 @@ In order to fix this, install the `rng-tools` package and
[enable](../../../config/services/index.md#enabling-services) the `rngd`
service, which uses the `/dev/hwrng` device to seed `/dev/random`.

Sometimes `rngd` can cause CPU overload. To prevent this inefficient entropy
sources must be excluded and HWRNG device forced:

```
echo "RNGD_OPTS='-x jitter -x pkcs11 -x rtlsdr -n hwrng'" > /etc/sv/rngd/conf
```

### Graphical session

The `mesa-dri` package contains drivers for all the Raspberry Pi variants, and
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