Re: mmap over nfs leads to excessive system load

[Kenny Simpson]

--- Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote:
> 
> Is this NFSv2?
> 
> Cheers,
>   Trond
> 
This is reproducible with O_DIRECT, but not without.

The profile looks the same:
samples  %        symbol name
647042   28.4114  zap_pte_range
572195   25.1249  unmap_mapping_range
324291   14.2395  _spin_lock
139259    6.1148  __bitmap_weight
137048    6.0177  zap_page_range
104614    4.5936  unmap_mapping_range_vma
63406     2.7841  debug_smp_processor_id
48906     2.1474  sub_preempt_count
46090     2.0238  unmap_vmas
27966     1.2280  add_preempt_count
23224     1.0198  invalidate_inode_pages2_range
21676     0.9518  unmap_page_range
17825     0.7827  _spin_unlock

I've had mixed results with a local ext3 file with the same test.  One run had a 37 second delay
while crossing 4GB, another happily went by without incident.

-Kenny



	
		
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