Re: [Lse-tech] 7.52 second kernel compile

[Gerrit Huizenga]

And this *without* the dcache_lock?  Hmm.  So you are saying there
may still be room for improvement?

BTW, are you doing this all out of cache/memory or do you have a
disk/controller quick enough to do the initial little file reads that
fast?

gerrit

In message <20020316061535.GA16653@krispykreme>, > : Anton Blanchard writes:
> 
> > Let the kernel compile benchmarks continue!
> 
> I think Im addicted. I need help!
> 
> In this update we added 8 cpus and rewrote the ppc64 pagetable management
> code to do lockless inserts and removals (there is still locking at
> the pte level to avoid races).
> 
> hardware: 32 way logical partition, 1.1GHz POWER4, 60G RAM
> 
> kernel: 2.5.7-pre1 + ppc64 pagetable rework
> 
> kernel compiled: 2.4.18 x86 with Martin's config
> 
> compiler: gcc 2.95.3 x86 cross compiler
> 
> make[1]: Leaving directory `/home/anton/intel_kernel/linux/arch/i386/boot'
> 128.89user 40.23system 0:07.52elapsed 2246%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (437084major+572835minor)pagefaults 0swaps
> 
> 7.52 seconds is not a bad result for something running under a hypervisor.
> The profile looks much better now. We still spend a lot of time flushing tlb
> entries but we can look into batching them.
> 
> Anton
> --
> [e-mail]
> [e-mail]
> 
> 155912 total                                      0.0550
> 114562 .cpu_idle                               
> 
>  12615 .local_flush_tlb_range                  
>   8476 .local_flush_tlb_page                   
>   2576 .insert_hpte_into_group                 
> 
>   1980 .do_anonymous_page                      
>   1813 .lru_cache_add                          
>   1390 .d_lookup                               
>   1320 .__copy_tofrom_user                     
>   1140 .save_remaining_regs                    
>    612 .rmqueue                                
>    517 .atomic_dec_and_lock                    
>    492 .do_page_fault                          
>    444 .copy_page                              
>    438 .__free_pages_ok                        
>    375 .set_page_dirty                         
>    350 .zap_page_range                         
>    314 .schedule                               
>    270 .__find_get_page                        
>    245 .page_cache_release                     
>    233 .lru_cache_del                          
>    231 .hvc_poll                               
>    215 .sys_brk                                
> 
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