David Lang wrote:
what could I do to assist in tracking down what is causing the contention?
Are you running a skas3-patched host kernel? You didn't mention if you
were running in 32bit mode. I don't believe there's a skas patch for
64bit kernels (yet). IMO, skas3 is required what you're after.
http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/
> I upped the pid_max value to 128000 to give me some headroom there (each
> of the first 18 uml instances will end up running ~3600 processes when
> they finish booting)
Sounds to me like you're running those UMLs in TT mode. If you
can't/aren't going to patch your host with skas3, at least run a recent
2.6-um kernel in skas0 mode, which doesn't require a host kernel patch.
The other two things are:
Use the cfq disk scheduler. elevator=cfq on your kernel command line
will do that, as long as it's compiled into your host's kernel.
Use tmpfs mount for TMPDIR, as UML will use that to store its memory file.
-Chris
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