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Re: [SE/Linux] status / progress report 13jun2004

On Mon, Jun 14, 2004 at 09:59:21AM -0400, James Morris wrote:
> > > It's actually disabled again (compiled in but disabled) in SuSE because
> > > the performance hit was much much worse.  And I remember benchmark
> > > numbers where the lsm hooks alone decreased the SpecWeb numbers on ia64
> > > by more than 10%.  I'd vote strongy against enabling LSM in the Debian
> > > kernel images.
> When did you see these figures?  They are not consistent with the 
> performance data I've seen.
> When I ran Webstone tests on x86 for the Usenix paper, there was a 5-7%
> performance hit for LSM, which dropped to 1-2% once the Netfilter hooks
> were disabled.  LSM was reworked considerably before submission to the
> upstream kernel, which included dropping the Netfilter hooks, as well as
> many other hooks in the networking, and the hooking mechanism itself was
> redesigned for efficiency.  LSM should have significantly less overhead 
> than the 1-2% figure for web performance.

They're from a hardware vendor doing benchmarking on one of the
commercial distros.  Note that this is on IA64 where gcc is particularly
bad when lots of indirect function calls are used.

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