Messages in this thread |  | | | Date | Tue, 3 Feb 2009 15:18:36 +0300 | | From | Evgeniy Polyakov <> | | Subject | Re: [PATCH v2] tcp: splice as many packets as possible at once |
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On Tue, Feb 03, 2009 at 11:12:09PM +1100, Herbert Xu (herbert@gondor.apana.org.au) wrote: > The only change we need to make is at receive time. Instead of > always pushing the received skb into the stack, we should try to > allocate a linear replacement skb, and if that fails, allocate > a fragmented skb and copy the data into it. That way we can > always push a linear skb back into the ring buffer.
Yes, that's was the part about 'reserve' buffer for the sockets you cut :)
I agree that this will work and will be better than nothing, but copying 9kb into 3 pages is rather CPU hungry operation, and I think (but have no numbers though) that system will behave faster if MTU is reduced to the standard one. Another solution is to have a proper allocator which will be able to defragment the data, if talking about the alternatives to the drop.
So: 1. copy the whole jumbo skb into fragmented one 2. reduce the MTU 3. rely on the allocator
For the 'good' hardware and drivers nothing from the above is really needed.
-- Evgeniy Polyakov
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