Re: page table lock patch V15 [0/7]: overview

From: Andrew Morton <akpm_at_osdl.org>
Date: 2005-01-13 05:43:26
Christoph Lameter <clameter@sgi.com> wrote:
>
> > Do we have measurements of the negative and/or positive impact on smaller
>  > machines?
> 
>  Here is a measurement of 256M allocation on a 2 way SMP machine 2x
>  PIII-500Mhz:
> 
>   Gb Rep Threads   User      System     Wall flt/cpu/s fault/wsec
>    0  10    1    0.005s      0.016s   0.002s 54357.280  52261.895
>    0  10    2    0.008s      0.019s   0.002s 43112.368  42463.566
> 
>  With patch:
> 
>   Gb Rep Threads   User      System     Wall flt/cpu/s fault/wsec
>    0  10    1    0.005s      0.016s   0.002s 54357.280  53439.357
>    0  10    2    0.008s      0.018s   0.002s 44650.831  44202.412
> 
>  So only a very minor improvements for old machines (this one from ~ 98).

OK.  But have you written a test to demonstrate any performance
regressions?  From, say, the use of atomic ops on ptes?
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Received on Wed Jan 12 13:44:55 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:34 EST