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On 7/9/12 3:07 PM, Jean Delvare wrote:
Le lundi 09 juillet 2012 à 10:44 -0400, Jeff Mahoney a
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?
It might be easier to check what other distributions
and simply align on that. Richard said that Debian and Fedora
"seemed" to enable it by default, it would have to be confirmed,
and ideally Ubuntu and RHEL should be checked as well.
Unfortunately I don't have any of these at home so I can't check.
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