[CentOS] FYI: Why is NFS slower on EL5 than EL4?

[Ross Walker]

On Sep 15, 2009, at 9:37 PM, Eugene Vilensky <evilensky at gmail.com>  
wrote:

>
>> For those who have wondered why NFS on EL5 is slower than on EL4 I
>> provide these links for your edification.
>>
>> http://kbase.redhat.com/faq/docs/DOC-15355
>
> This was introduced in 5.4 or 5.0 or somewhere between?

>

The time based scheduling was introduced in 5.0.

Honestly even the quantum based scheduling in 4.0 had performance  
problems with kernel based threads, just less obvious.

All kernel based IO should run under the same IO context, it doesn't  
make sense to have the kernel competing against itself. The only  
exception to that would be a RT kernel that might have a RT context  
that preempts even the kernel context.

-Ross
  
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