Meant to go to list <div class="gmail_quote">On Apr 18, 2013 2:15 PM, "John Moser" <<a href="mailto:john.r.moser@gmail.com">john.r.moser@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On Apr 18, 2013 2:07 PM, "Insanity Bit" <<a href="mailto:colintrexob@gmail.com" target="_blank">colintrexob@gmail.com</a>> wrote: > > On 64bit multiple services (pulseaudio, rsyslogd, many others) are shipping without Position Independent Code. On 32bit there is a potential performance hit for startup time... but there shouldn't be any performance hit (or negligible) on 64bit. > There is a continuous performance hit of under 1% without -fomit-frame-pointer and under 6% with -fomit-frame-pointer on IA-32. The impact is statistically insignificant (i got 0.002% +/- 0.5%) on x86-64. The performance hit on IA-32 only applies to main executable code because library code is PIC already. This accounts for under 2% runtime, except in X where it used to be 5%. That makes the overall impact 2% of 6% or 0.12%--which is non-existent if your CPU is ever at less than 99.88% load because you would swiftly catch up. In other words: there is NO PERFORMANCE HIT for PIE in any non-laboratory, non-theoretical situation. (Theo de Raadt argued this with me once, using the term "very expensive" a lot. I built two identical Gentoo boxes and profiled them both extensively with oprofile. It is exactly a theoretical cost, and the performance concerns come from people who have no clue what the execution flow of modern software looks like) > "PIE on x86_64 does not have the same penalties, and will eventually be made the default, but more testing is required." > - <a href="https://wiki.ubuntu.com/Security/Features#pie" target="_blank">https://wiki.ubuntu.com/Security/Features#pie</a> > > Is there an open bug for testing? A way for users to test and give feedback without recompiling massive projects like pulseaudio? > > 13.04 still doesn't ship PIE. I would expect this would be something you'd want to put in *before* an LTS release? > > > -- > Ubuntu-devel-discuss mailing list > <a href="mailto:Ubuntu-devel-discuss@lists.ubuntu.com" target="_blank">Ubuntu-devel-discuss@lists.ubuntu.com</a> > Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss</a> > </blockquote></div>