[Xen-users] Low /proc/sys/kernel/random/entropy_avail on domU

["cornet@xxxxxxxxxx" <cornet@xxxxxxxxxx>]

This problem came about when I noticed exim, on a domU, holding mail in 
its queue for days before delivering.
After a bit of debugging then I found gnutls was taking ages to 
calculate its keys.
So disabled TLS in exim and works fine.

Then I had another xen domU doing exactly the same thing so I did some 
more digging and came up with this post:
http://groups.yahoo.com/group/exim-users/message/85430

sure enough
/proc/sys/kernel/random/entropy_avail = 0
when mail is stuck in the queue.

Now I've stopped exim from using TLS again, and I don't think there is 
much else running that could be using up the entropy, but the entropy is 
still low, max I've seen it is ~300. (Compaired to 3000+ on other 
non-xen boxes).
Both these servers are similar set up (although I didn't setup the 2nd one):

Debian - Sarge as dom0 and domU.
kernel 2.6.11.12-xen0/U
Xen 2.0 compiled from source.

So why do these boxes have low entropy, I've never seen this on non-xen, 
hence posting here.
Ideas welcome.

Cheers
Nathan

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