Re: RFC: dirty_ratio back to 40%

[Richard Kennedy <richard@rsk.demon.co.uk>]

On 20/05/10 13:29, Heinz Diehl wrote:
> On 20.05.2010, Larry Woodman wrote: 
> lwoodman@redhat.com
>> Increasing the dirty_ratio to 40% will regain the performance loss seen
>> in several benchmarks.  Whats everyone think about this???
> 
> These are tuneable via sysctl. What I have in my /etc/sysctl.conf is
> 
>  vm.dirty_ratio = 4
>  vm.dirty_background_ratio = 2
>  
> This writes back the data more often and frequently, thus preventing the
> system from long stalls. 
> 
> Works at least for me. AMD Quadcore, 8 GB RAM.
> 
get_dirty_limits uses a minimum vm_dirty_ratio of 5, so you can't set it
lower than that (unless you use vm_dirty_bytes).
But it's interesting that you find lowering the dirty_ratio helpful. Do
you have any benchmark results you can share?
regards
Richard

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