I've come across another solution that this would be useful.  In the
testing of filesystems with compression enabled (zfs, btrfs).  Trying to
figure out raw write speeds using /dev/zero is meaningless because the
data is highly compressed.  Using /dev/urandom is too slow (~ 6MB/s).
Based on this post from stackoverflow
(http://serverfault.com/questions/6440/is-there-an-alternative-to-dev-
urandom) I tried:

time openssl rand 1000000000 | head -c 1000000000 > testfile

which worked ok.  But being able to use dd with erandom would be ideal
for this situation.

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https://bugs.launchpad.net/bugs/575669

Title:
  Rapid depletion of entropy pool

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