Accelerating push via bzr:// and friends

[Robert Collins]

On Tue, 2008-05-20 at 19:47 +1000, Andrew Bennetts wrote:
> 
> 
> Here's a couple of things I'm doing right now, because I know other
> some other
> people are looking at similar areas and it would be good to avoid
> duplicating
> our efforts:
> 
>  - buffering in _ProtocolThreeEncoder.  For some reason setting
> TCP_NODELAY
>    isn't enough to avoid waiting for ACKs when doing lots of small
> writes.  So
>    I'll make it buffer so that it does exactly one send() call for
> most packets
>    (unless they have a streamed body).

NODELAY stops the kernel buffering, so you get lots of packets on the
wire; otoh it means when we are being chatty we don't have to wait.
Perhaps we don't want NODELAY?

>  - investigating why get_parent_map is regularly being called after
> the main
>    work is done, and stop doing it.

Its probably generating branch history.

> Initial tests suggest that bzr.dev has regressed a bit since 1.4!  But
> fixing
> those two issues (especially the first) should put us ahead.

Cool.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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