Re: [PATCH 0/5] Memory controller soft limit patches (v7)

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Tue, 24 Mar 2009 23:04:14 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> I've run lmbench with the soft limit patches and the results show no
> major overhead, there are some outliers and unexpected results.
> 
> The outliers are at context-switch 16p/64K, in communicating
> latencies and some unexpected results where the softlimit changes help improve
> performance (I consider these to be in the range of noise).
> 

ok, seems no regressions. but what is the softlimit value ?
I think there result is of course souftlimit=0 case value...right ?

-Kame

>                  L M B E N C H  2 . 0   S U M M A R Y
>                  ------------------------------------
> 
> 
> Basic system parameters
> ----------------------------------------------------
> Host                 OS Description              Mhz
>                                                     
> --------- ------------- ----------------------- ----
> nosoftlim Linux 2.6.29-        x86_64-linux-gnu 2131
> softlimit Linux 2.6.29-        x86_64-linux-gnu 2131
> 
> Processor, Processes - times in microseconds - smaller is better
> ----------------------------------------------------------------
> Host                 OS  Mhz null null      open selct sig  sig  fork exec sh  
>                              call  I/O stat clos TCP   inst hndl proc proc proc
> --------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ----
> ---- ----
> nosoftlim Linux 2.6.29- 2131 0.67 1.33 29.9 36.8 6.484 1.12 12.1 508. 1708 6281
> softlimit Linux 2.6.29- 2131 0.66 1.31 29.8 36.8 6.486 1.11 12.3 483. 1697 6241
> 
> Context switching - times in microseconds - smaller is better
> -------------------------------------------------------------
> Host                 OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
>                         ctxsw  ctxsw  ctxsw ctxsw  ctxsw   ctxsw ctxsw
> --------- ------------- ----- ------ ------ ------ ------ --------------
> nosoftlim Linux 2.6.29- 2.190 9.2300 3.1900 9.7400   10.8 7.93000 4.36000
> softlimit Linux 2.6.29- 0.970 4.8200 3.1300 8.8900   10.3 8.82000 10.7
> 
> *Local* Communication latencies in microseconds - smaller is better
> -------------------------------------------------------------------
> Host                 OS 2p/0K  Pipe AF     UDP  RPC/   TCP  RPC/ TCP
>                         ctxsw       UNIX         UDP         TCP conn
> --------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
> nosoftlim Linux 2.6.29- 2.190  22.0 58.5  53.3  68.7  61.7  64.9 210.
> softlimit Linux 2.6.29- 0.970  20.3 55.3  54.0  53.8  79.7  64.5 211.
> 
> File & VM system latencies in microseconds - smaller is better
> --------------------------------------------------------------
> Host                 OS   0K File      10K File      Mmap    Prot Page    
>                         Create Delete Create Delete  Latency Fault Fault 
> --------- ------------- ------ ------ ------ ------  ------- ----- ----- 
> nosoftlim Linux 2.6.29-   51.6   48.6  153.6   87.4    20.2K 7.00000
> softlimit Linux 2.6.29-   51.6   48.2  137.8   83.9    20.2K 6.00000
> 
> *Local* Communication bandwidths in MB/s - bigger is better
> -----------------------------------------------------------
> Host                OS  Pipe AF    TCP  File   Mmap  Bcopy  Bcopy  Mem
> Mem
>                              UNIX      reread reread (libc) (hand) read write
> --------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
> nosoftlim Linux 2.6.29- 1367 778. 803. 2058.5 4659.4 1303.9 1303.5 4664 1422.
> softlimit Linux 2.6.29- 1314 823. 812. 2061.3 4659.9 1290.2 1280.9 4662 1422.
> 
> Memory latencies in nanoseconds - smaller is better
>     (WARNING - may not be correct, check graphs)
> ---------------------------------------------------
> Host                 OS   Mhz  L1 $   L2 $    Main mem    Guesses
> --------- -------------  ---- ----- ------    --------    -------
> nosoftlim Linux 2.6.29-  2131 1.875 6.5990   76.8
> softlimit Linux 2.6.29-  2131 1.875 6.5980   76.8
> 
> Earlier, I ran reaim and saw no regression there as well.
> 
> -- 
> 	Balbir
> 

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