sbin/devd/devd.cc
    Increase the size of devd's client socket's send buffer from the
    default (8k) to 128k.  This prevents clients from getting
    POLLHUPped during event storms.  For example, during zpool creation,
    the kernel emits a resource.fs.zfs.statechange event for every vdev
    in the pool.  A 128k buffer is large enough to hold the statechange
    events for a pool with nearly 800 drives.