On 12/04/2011 02:01 PM, Michael S. Tsirkin wrote:

quoted

How much better?

I think that if indirects benefit networking, then we're doing something
wrong.  What's going on?  Does the ring get filled too early?  If so we
should expand it.

The ring is physically contigious.
With 256 entries and 64 bytes each, that's already 16K.

A descriptor is just 16 bytes.  There's also the used ring, but that's a
mistake if you have out of order completion.  We should have used copying.

16kB worth of descriptors is 1024 entries.  With 4kB buffers, that's 4MB
worth of data, or 4 ms at 10GbE line speed.  With 1500 byte buffers it's
just 1.5 ms.  In any case I think it's sufficient.

-- 
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