Le lundi 09 juillet 2012 à 10:44 -0400, Jeff
Mahoney a écrit :
On 7/9/12 10:37 AM, Jean Delvare wrote:
> So, unless someone objects by then, I'll set
> CONFIG_CC_STACKPROTECTOR=y in i386 and x86_64 kernels
Thanks for looking into this, Jean. Since we don't have a bnc in
the commit log to see what the performance degradation looked
like originally, I'd like to see some analysis now to actually
confirm whether it makes a difference anymore.
openSUSE 12.2 was supposed to be released in two days time but
was delayed due to too much churn (among other things). If there
is a performance difference, I'd prefer to know about it before
we do the change rather than depend on post-release bug reports
and the accompanying hand-wringing over whether to revert it.
Are you simply suggesting that I should change the configuration
for master only and not the openSUSE-12.2 branch? Or should I wait
even for master?
I admit I'm not sure how to test for performance regression. With
CONFIG_CC_STACKPROTECTOR_ALL it was relatively obvious, but now
that only selected functions get the protection, I can imagine that
the performance hit completely depends on the drivers, filesystem
etc. in use.
A quick look makes it seem like it really only has an effect during
Mike - What would you use to test this?