| 1 |
>> >> >> My website seems a bit slower since I enabled grsecurity on that |
| 2 |
>> >> >> system. Is that typical? Is it most likely due to MPROTECT, or |
| 3 |
>> >> >> something else? |
| 4 |
>> >> > |
| 5 |
>> >> > can you quantify this slowdown? and what grsec/pax features did you enable? |
| 6 |
>> >> |
| 7 |
>> >> I enabled the grsecurity "Gentoo (server)" profile in the hardened |
| 8 |
>> >> kernel. |
| 9 |
>> > |
| 10 |
>> > ok, is PAGEEXEC enabled (and SEGMEXEC isn't) and is your cpu some P4 variant |
| 11 |
>> > without NX support? that's about the only situation where you should see an |
| 12 |
>> > observable slowdown, otherwise i doubt you can percieve a few % without |
| 13 |
>> > actual measurements. so if neither is your case, it's definitely worth an |
| 14 |
>> > investigation. |
| 15 |
>> |
| 16 |
>> Very close. PAGEEXEC is enabled, but so is SEGMEXEC. My CPU is a |
| 17 |
>> P4-2.8, and I'm not sure about NX support but these are the flags: |
| 18 |
> |
| 19 |
> |
| 20 |
> Disable PAGEEXEC and switch to SEGMEXEC on the P4. That slowdown will go |
| 21 |
> away. No idea why on earth the (server) options would enable such a |
| 22 |
> thing on the x86 platform. |
| 23 |
|
| 24 |
menuconfig isn't letting me disable PAGEEXEC. Maybe it's tied to |
| 25 |
grsecurity "Gentoo (server)"? I don't want to disable that. Maybe I |
| 26 |
should live with the slowdown? |
| 27 |
|
| 28 |
- Grant |
Archives