On Tue, Aug 17, 2010 at 02:37:09PM -0400, Eric Paris wrote:

 > > ideally, when an application that cares about this is installed, it could 
 > > increase it via sysctl.conf 
 > > That default isn't a one size fits all. Regardless of what we set it to,
 > > someone is going to want it smaller/bigger.
 > 
 > I think we want to be very careful how much we suggest $random-package
 > muck with sysctl.  Ubuntu got a black eye since wine automatically
 > changed mmap_min_addr if it was installed.  It's not always clear what
 > the implications of a change include.  How many people on this list (the
 > kernel list) would have guessed that the suggestion here would allow
 > 5-10 users completely DoS a 32 machine?
 > 
 > Rex, if you do decide to change it in sysctl lets try to keep it within
 > a factor of 10 or so?  You might want to ask the upstream kernel
 > community what they think.

It's unfortunate that we have no way to determine at install time
"this is going to be a multiuser machine"
There are probably a bunch of other changes that a standalone desktop machine
could make knowing that.

        Dave

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