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SubjectRe: RCU issue with SELinux (Re: SELINUX performance issues)
Date
Hi James, Thanks for your comments.

> Do you have figures for 1 and 2 CPU?

The results of 1CPU and 2CPU are following: (2.6.8.1-RCU by take2 patch)
[write() to files on tmpfs Loop=500000 Parallel=<Num of CPU>]
-- 1CPU-- -- 2CPU-- -- 4CPU-- -- 8CPU-- --16CPU-- --32CPU--
2.6.8.1(disable) 8.2959 8.0430 8.0158 8.0183 8.0146 8.0037
2.6.8.1(enable) 11.8427 14.0358 78.0957 319.0451 1322.0313 too long
2.6.8.1.rwlock 11.2485 13.8688 20.0100 49.0390 90.0200 177.0533
2.6.8.1.rcu 11.3435 11.3319 11.0464 11.0205 11.0372 11.0496

> Also, can you run some more benchmarks, e.g. lmbench, unixbench, dbench
> etc?

The results of unixbench and dbench are following:

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

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

> > > + hvalue = atomic_inc_return(&avc_cache.lru_hint) % AVC_CACHE_SLOTS;
>
> atomic_inc_return() is not implemented on ia32 or x86-64. Is there a
> workaround, or do we need to implement it? (Andi Kleen suggested using
> the xadd instruction and altinstructions for i386).

Oops!
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.

Thanks.
--------
Kai Gai <kaigai@ak.jp.nec.com>
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