On Thu, 16 Dec 2010 19:56:50 -0500 "Jeremy O'Brien" <obrien6...@gmail.com> wrote:
> On Tue, Oct 12, 2010 at 01:57:20PM +0200, Alexandre Ratchov wrote: > > On Tue, Oct 12, 2010 at 12:41:04AM +0400, Dmitry-T wrote: > > > Try to recover ballance: > > > renice 20 -p 30996 > > > renice -20 -p 21919 25914 754 > > ^^^^^ > > > > If you run any cpu bound process with priority -20, you will give all > > the cpu to that process, without giving any chance to other processes > > to run, so your box will hang until it terminates. This requires root > > privileges. > > > > > > > > It is not secure. One user script or program may load CPU and > > > database or another servers lost speed in disk operations. > > > This is hole for DOS attacks in OpenBSD design. > > > > Yeah, this is an attack root can do by renicing a cpu bound process, > > but ``rm -rf /'' is much easier, isn't it? > > I was curious why no one brought this up earlier. A normal user _can't_ > nice processes to anything below 0. Therefore this point is moot. > It's definately in there and in a couple of places I think, among the chaff, It turned into two threads. I couldn't recreate the problem originally stated either. There was some differences to the Linux scheduler and disk io brought up that was slightly debateable but generally favoured the linux scheduler atleast when taken by itself, AFAIK.
