Messages in this thread | | | Date | Tue, 3 Feb 2009 23:33:38 +1100 | From | Herbert Xu <> | Subject | Re: [PATCH v2] tcp: splice as many packets as possible at once |
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On Tue, Feb 03, 2009 at 03:30:15PM +0300, Evgeniy Polyakov wrote: > > But we can proceed the discussion in case something interesting will > appear. For example I can hack up e1000e driver to do a dumb copy of 9k > each time it has received a jumbo frame and compare it with usual 1.5k > MTU performance. But getting that modern CPUs are loafing with noticebly > big IO chunks, this may only show that CPU was increased with the copy. > But still may work.
Comparing performance is pointless because the only time you need to do the copy is when the allocator has failed. So there is *no* alternative to copying, regardless of how slow it is.
You can always improve the allocator whether we do this copying fallback or not.
Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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