Am 09.01.2015 um 00:16 schrieb Dennis Gilmore:
On Thu, 08 Jan 2015 20:25:36 +0100 Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote:Am 08.01.2015 um 19:45 schrieb Miloslav Trmač:= Proposed System Wide Change: Harden all packages with position-independent code = Harden all packages with position-independent code to limit the damage from certain security vulnerabilities.So this proposal is for _all_ architectures, including the register-starved 32-bit i?86 where the overhead is, IIRC, around 10%. I am by now quite convinced that x86_64 should be using PIE by default. As for 32-bit, I’m torn between “this is too much overhead” and “32-bit isn’t worth the worry, let’s instead make the defaults consistent.”probably not worth the worry, new machines are x86_64 mostly, keep in mind RHEL7 dropped i686 at all even if they are still used - 10% sounds much *but* such old machines mostly have a special task and are far away from noticeable load and it really depends on the workload if you even notice 20% performance drop at least i doubt there is a noticeable userbase with i686 running Fedora at all *and* would notice the drop noticeableall of the OLPC XO 1.0 and 1.5 devices are running i686 fedora, that userbase is in the millions, but would they notice the performance drop I do not know.
that would be the main question and how large is the real impact besides syntetic benchmarks - thats partly the same as for how fast your machine boots - how often does it boot a day and the same for starting applications when consider caching
a benchmark is nice to compare and get a picture but it practically never reflects the typical workload of a human (let us ignore FPS and games at that point)
It would be interesting to see how performance was impacted on 32 bit arm
given that this thread made clear most mobile operating systems enforce full PIE/PIC and most are running ARM on 32 bit i'd say if we have a much larger problem if that's a showstopper for Fedora
however, numbers and *real human testing* would be interesting too
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