Re: [PATCH v2] tcp: splice as many packets as possible at once

[Herbert Xu]

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,
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