In Linux, you can make IPv4 traffic have a higher priority than IPv6 by running the following command:

sudo sh -c "echo 'precedence ::ffff:0:0/96 100' >> /etc/gai.conf"

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If you run out of memory in Linux, you can create a file to hold additional memory using these commands:

/bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
/sbin/mkswap /var/swap.1
/sbin/swapon /var/swap.1
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In Ubuntu (and probably other OSes) you can create an empty file, resize it to a couple GBs, create a filesystem on it, and then mount it at any location. You can treat this as a virtual drive to, for example, limit the size of a directory:

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