On 2015-07-05, Gordon Messmer <gordon.messmer at gmail.com> wrote: > On 07/05/2015 04:51 AM, Liam O'Toole wrote: >> One practical difference I have seen is the improved performance of >> -Y over -X. I have long attributed that to the relaxation of security >> controls in the former case. > > When and how did you measure that? > > The -Y change was introduced in Fedora Core 3, in November 2004. The > default was changed to ForwardX11Trusted=yes just a month or two > later. I'm not sure -X and -Y ever behaved differently on Enterprise > Linux or CentOS. > > At this point, I don't think it's even possible to set > ForwardX11Trusted=no any more. The X SECURITY extension was replaced > with "X Access Control Extension" several years ago. The perceived difference was a general impression on my part, and not measured scientifically. Moreover, it was formed years ago, and on a variety of Linux systems. I concede that it may well be obsolete. -- Liam