[uml-user] UML randomly hanging

[Jon F. <jon...@jf...>]

I'm using a stock Debian 7 AMD-64 SMP install on a 8 core Intel Xeon
server, with 24GB of RAM. I'm using Debian's supplied UML kernel and
tools. "uname -a", from within the UML returns: "Linux lamp1 3.2.54 #2
Thu Feb 6 22:33:28 UTC 2014 x86_64 GNU/Linux". Using a command like:

linux.uml "umid=$MACHNAME" con0=null,fd:2 con1=fd:0,fd:1 \
         con=null ssl=null "mem=4096m" "eth0=tuntap,tap0" \
         hostfs=/var/local/umlhostfs "ubd0=$ROOT" "ubd1=$SWAP"

Obviosuly the environment variables are filled with appropriate values.

I'm running a Debian 5 LAMP stack inside the UML. "/tmp" is a regular
disk backed filesystem. It runs ok if its not doing anything. But even
then from time to time you'll get a second or two pause. If it gets  a
modest amount of traffic it will hang for a few minutes, and things just
get worse and worse from there.

While its idle I've seen "hrtimer" warnings with 9 or 10 digit
nanosecond counts. I think this is at the heart of my problem.

Anybody have any advice?

TIA - Jon

-- 
Sent from my Debian Linux workstation -- http://www.debian.org/intro/about

Jon Foster
JF Possibilities, Inc.
jo...@jf...
541-410-2760
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