Re: [RFC] [PATCH v2 3/3] Let host NIC driver to DMA to guest userspace.

[Stephen Hemminger]

On Tue, 6 Apr 2010 14:26:29 +0800
"Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx> wrote:

> >How do you deal with the DoS problem of hostile user space app posting huge
> >number of receives and never getting anything.   
> 
> That's a problem we are trying to deal with. It's critical for long term.
> Currently, we tried to limit the pages it can pin, but not sure how much is reasonable.
> For now, the buffers submitted is from guest virtio-net driver, so it's safe in some extent
> just for now.

It is critical even now. Once you get past toy benchmarks you will see things like
Java processes with 1000 threads all reading at once. 
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