cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/i386/i386 mp_machdep.c

Brooks Davis brooks at
Sun Nov 11 19:59:13 PST 2007

On Sat, Nov 10, 2007 at 06:25:03PM -0800, Colin Percival wrote:
> Maxim Sobolev wrote:
> > For what it is worth I think Nate has the correct point. We should not
> > force this setting upon each and every user if it can realistically
> > affect only 0.0001% of our userbase.
> We're not forcing anything -- it's configurable via loader.conf.  All
> we're talking about is changing the default value.
> > By the way, I wonder how sun4v (aka Niagara) fares in this respect. As
> > long as I know, they use similar concept, when 8 physical cores can run
> > 32 threads. Should we disable it by default there as well? ;-)
> I haven't seen any experiments done on sun4v, but I'm less concerned about
> it since I believe sun4v boxes are used more often for large computing jobs
> rather than for interactive logins with many untrusted users.  Of course,
> if/when we have scheduler support for keeping different users on separate
> cores, this should be applied to sun4v as well.

Actually, webhosting is probably the most common use of sun4v systems.
As such, I'd expect that virtual hosting with large numbers of untrusted
users running code on the same machine to be fairly common.

-- Brooks
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