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SubjectRe: RCU issue with SELinux (Re: SELINUX performance issues)
On Tue, 24 Aug 2004, Kaigai Kohei wrote:

> o UNIXbench
>
> * INDEX value comparison
> 2.6.8.1 2.6.8.1 2.6.8.1 2.6.8.1
> (Disable) (Enable) (rwlock) (RCU)
> Dhrystone 2 using register variables 268.9 268.8 269.2 269.0
> Double-Precision Whetstone 94.2 94.2 94.2 94.2
> Execl Throughput 388.3 379.0 377.8 377.9 +
> File Copy 1024 bufsize 2000 maxblocks 606.6 526.6 515.6 504.8 *
> File Copy 256 bufsize 500 maxblocks 508.9 417.0 410.4 395.2 *
> File Copy 4096 bufsize 8000 maxblocks 987.1 890.4 876.0 857.9 *
> Pipe Throughput 525.1 406.4 404.5 408.8 +
> Process Creation 321.2 317.8 315.9 316.3 +
> Shell Scripts (8 concurrent) 1312.8 1276.2 1278.8 1282.8 +
> System Call Overhead 467.1 468.7 464.1 467.2 +
> ========================================
> FINAL SCORE 445.8 413.2 410.1 407.7

This benchmark somewhat characterizes 1P performance, and the ones I've
marked with (*) get noticably worse with the RCU patch compared to the
current locking scheme. Tests marked (+) show no or insignificant
improvement.

Might be useful to compare with the lmbench macrobenchmark, to see if it
shows a similar pattern.

> o dbench [ 4 processes run parallely on 4-CPUs / 10 times trials ]
> ---- mean ---- - STD -
> 2.6.8.1(disable) 860.249 [MB/s] 44.683
> 2.6.8.1(enable) 714.254 [MB/s] 32.359
> 2.6.8.1(+rwlock) 767.904 [MB/s] 27.968
> 2.6.8.1(+RCU) 830.678 [MB/s] 16.352

Can you show the figures for 1 and 2 clients?

> In IA-32 or x86_64, can anybady implement atomic_inc_return()?
> If it can not, I'll try to make alternative macros or inline functions.

If you can get this done, it will be very useful, as I could allso run
some benchmarks on my test systems.


- James
--
James Morris
<jmorris@redhat.com>





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