Andrew Morton wrote:
> On Tue, 29 Apr 2008 16:33:04 +0200
> Nadia.Derbey@bull.net wrote:
> 
> 
>>After scalability problems had been detected when using the sysV ipcs, I
>>have proposed to use an RCU based implementation of the IDR api instead
>>(see thread http://lkml.org/lkml/2008/4/11/212).
>>
>>Resending the patch series after
>> . integrating Paul's remarks
>> . fixing a bug I had introduced
>> . porting it to 2.6.25-mm1.
>>
>>Reviewers are still welcome!
>>
>>Patch 1 can be taken alone: it fixes a problem in the existing IDR API.
>>
>>Patches should be applied on linux-2.6.25-mm1, in the following order:
>>
>>[ PATCH 01/10 ] : idr_minor_fix.patch
>>[ PATCH 02/10 ] : ridr_structure.patch
>>[ PATCH 03/10 ] : ridr_pre_get.patch
>>[ PATCH 04/10 ] : ridr_init.patch
>>[ PATCH 05/10 ] : ridr_get_new_above.patch
>>[ PATCH 06/10 ] : ridr_get_new.patch
>>[ PATCH 07/10 ] : ridr_find.patch
>>[ PATCH 08/10 ] : ridr_remove.patch
>>[ PATCH 09/10 ] : ipc_use_ridr.patch
>>[ PATCH 10/10 ] : remove_ipc_lock_down.patch
>>
> 
> 
> hm, you've been busy.
> 
> As all this work is entirely for performance reasons, the changelog should
> have (lots of) performance testing results!  Please.
> 
> 

Here are the results I've got  for the pmsg test sent by Manfred:

for i in 1 2 3 4 5 6 7 8;do ./pmsg $i 5;done > output.25_mm1.ref.8
for i in 1 2 3 4 5 6 7 8;do ./pmsg $i 5;done > output.25_mm1.patch.8


                 2.6.25-mm1 (ref)   2.6.25-mm1(patched)

Total (1 cpu):   876000             985496
Total (2 cpus): 1549592            1740591
Total (3 cpus): 1694370            2327468
Total (4 cpus):  404553            2465787
Total (5 cpus):  391283            3215676
Total (6 cpus):  263249            3849121
Total (7 cpus):  191742            4209866
Total (8 cpus):  141722            4255585



Full output files attached.

Will send the rest tomorrow.

Regards
Nadia