being used in an experiment (node, virthost, delaynode,
       simnode). This is for helping to simplify the swapmod code
       support in assign, and to eventually fix the delaynode problem.

also.

final time, so that we can see how long things take. As per Jay's
request.

final time, so that we can see how long things take. As per Jay's
request.

is turned on; 60MB of exports files is not really needed these days.

tbswap to use this version inside the testbed project only! All other
projects will see the old version for now; there are just too many
things to test, and the testsuite gets just a fraction of them. Some
highlights (which I will expand on later when I commit this version to
the main version):

* New -t option to create the TOP file, and then exit. The only other
  side effect of this is to update the min/max nodes for the
  experiment in the DB, unles new option -n (impotent mode) is given.

* New -n option to operate in impotent mode; do not allocate nodes and
  do not modify the DB. Okay, so this option is not as great as it
  sounds. I eventually hit the point of diminishing returns, with
  trying to make things work right without DB modification. At some
  point I just throw in the towel and exit. This currently happens after
  interpolating the link results of assign. But, I have found it very
  useful, and could get better with time. Being able to run assign on
  the main DB without sucking up the nodes is nice for debugging.

* Lots of data structure organization, mostly on the virtual topology
  side of assign (you can think of assign as two sections, the part
  that interprets the DB tables and creates the TOP file, and the part
  that reads the results of assign and sets up all the physical stuff
  in the DB). I removed numerous global hashes, and combined them into
  aggregate data structures, such as they are in Perl. My approach for
  this was to read the tables from the DB, and keep them handy,
  extending them as needed with stuff that assign_wrapper generates as
  it proceeds. This has the side effect of cutting down on the number
  of queries as well.

  The next task is to do the physical side reorg, but not up for that
  yet.

utlimate solution to this whole problem is to change the experiment
state so that we can distinguish between real swapout and swapout
caused by swapmod/retry/error. Or, we need to add more intermediate
allocstates for the nodes. Not sure yet.

can I say? This page is public, and linked from various places.

recreated at jail reboot. Note this file is *inside* the jail and
consists of the common routes (gateway, loopback, etc).

we didn't reeally want to send packets on those interfaces anyway.

In some cases (such as nodes that are not 'fully' in the testbed
yet), this has to be done by an external program.

* Generalized some statements a bit to cover both Linux and FreeBSD
* Added some Linux specifics

logged in the day before.

Here we have the Linux delaysetup startup script - first revision.  This
uses iproute2+tc, modprobe, and iptables to setup traffic shaping.
A few notes are warranted:

1) [g]red is not yet supported
   - need to make these modules classful in the kernel first

2) sysctls are used here to up the amount of buffer space available for
   sk_bufs (socket buffers).  Couldn't see a place to do this in the kernel
   config.

3) Only linkdelay support is implemented
   - probably could add normal delay-node support without too much trouble.

4) reverse pipe numbers are (currently) ignored
   - not needed since the IMQ device used to shape incoming traffic
     is distinct from the actual interface - no namespace collision.

5) Kernel selection is similar to FBSD: check running kernel, and reboot
   if the kernel version isn't what we expect (have to rerun lilo too)

Both changes to the kernel, and to userland control applications are included
in this checkin.  At present, these files are combined patches; I'll be
separating out the Emulab specific additions/changes in the near future.

The best resource (currently) for understanding the Linux traffic control
mechanisms is at the Linux Diffserv project home page (under Documentation):
http://diffserv.sourceforge.net/

The most noteworthy contributions I've made are the PLR module and DELAY
module port and enhancement.  These two modules are classful (though they
don't use classification filters) and can be chained together with other
modules such as the Heirarchical Token Bucket (used for limiting bandwith).
See: http://luxik.cdi.cz/~devik/qos/htb/

Note that this checkin also includes the patches necessary to obtain
Intermediate Queueing Devices (IMQ) and HTB control under iproute2+tc.  The
IMQ devices allow the attachment of qdiscs on the incoming side of a real
interface (can't do this without them). See: http://trash.net/~kaber/imq/

The Linux Advanced Routing HOWTO is another good source of information:
http://lartc.org

warning for reverse subnets that have no hosts.

entries for both types to $USERSNODE.

Add support for generating reverse maps as well as forward ones.

The result is that you should no longer put the nodes into the main
.head file, and any reverse zones for which there are .head files
will get generated as well.

noted by Chris.

installed.

to the nodes table. The nodes table needs to come first when joining,
if you have a specific node you want to look at (in the where clause).

the users.

so that we can, say, ssh in to reboot it later.

Also, needs to be able to run sudo (as the admin) so that it can
restart dhcpd.

the node was temporarily given while it's configuring.

configurable via a sitevar. Also make autoswap warnings use a sitevar too.

You can adjust (or turn off) idleswap and Max Duration warnings by setting
the corresponding site vars, where 0==no warning.