Re: [RFC] [PATCH 0/3] ioat: DMA engine support

[Avi Kivity]

Andi Kleen wrote:

> > Don't forget that there are benefits of not polluting the cache with the 
> > traffic for the incoming skbs.
> >    
>
> Is that a general benefit outside benchmarks? I would expect
> most real programs to actually do something with the data
> - and that usually involves needing it in cache.
>
>  
As an example, an NFS server reads some data pages using iSCSI and sends 
them using NFS/TCP (or vice versa).

> > In the I/O AT case it might make sense to do a few prefetch()es of the 
> > userland data on the return-to-userspace code path.  
> >    
>
> Some prefetches for user space might be a good idea yes
>
>  
As long as they can be turned off. Not all usespace applications want to 
touch the data immediately.



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