qemu eats up /dev/shm

I’ve been using qemu ([with kqemu]{kqemu-install}) to run my client’s windows software, which talks to the linux driver/daemon that I am working on. Having multiple qemu instances really chews into the shared memory… and the amount available depend on how /dev/shm is mounted.

    # df /dev/shm
    Filesystem            Size  Used Avail Use% Mounted on
    none                  2.0G  713M  1.4G  35% /dev/shm

On Debian you can control this via /etc/default/tmpfs SHM_SIZE variable….

    SHM_SIZE=2048m

That’s 2 gigs total that I can give to all the VMs.