Re: [Qemu-devel] [PATCH 1/3] configure: add option to disable -fstack-protector flags

[Brad Smith]

On 09/01/14 5:40 PM, Paolo Bonzini wrote:
> Il 09/01/2014 22:55, Steven Noonan ha scritto:
> > From: Steven Noonan <address@hidden>
> >
> > The -fstack-protector flag family is useful for ensuring safety and for
> > debugging, but has a performance impact. Here's a boot time comparison between
> > a QEMU build of qemu-system-arm with and without the -fstack-protector-all
> > flag:
> >
> >      # WITHOUT -fstack-protector-all
> >      address@hidden ~]# systemd-analyze
> >      Startup finished in 1.744s (kernel) + 11.345s (initrd) + 47.164s 
> > (userspace) = 1min 255ms
> >
> >      # WITH -fstack-protector-all
> >      address@hidden ~]# systemd-analyze
> >      Startup finished in 1.843s (kernel) + 12.262s (initrd) + 1min 3.480s 
> > (userspace) = 1min 17.587s
>
> Can you try -fstack-protector-strong?
>
> Probably the right thing to do is to pick in order
> -fstack-protector-strong, -fstack-protector, and nothing.

+1


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