Re: Libsoup patches // Performance metrics

[Sergio Villar Senin <svillar igalia com>]

En 09/04/13 13:37, Ennes, Pieter escribiu:
> Hi,
>
> Linked to below are two old patches to libsoup-2.30 that I'd like to discuss for enhancement:
>
> 1) https://bitbucket.org/watchmouse/libsoup/commits/0e514092bb9733f4c548aa65ec13cca24f240b98
>
> A SoupMessage 'got-raw-chunk' event, analogous to the existing 'got-chunk', but emitted just before the 
> chunk body is decoded. It allows the client to inspect the content as it goes over the wire, which we use 
> to get an accurate measure of the number of bytes received, but I can imagine it could serve different 
> purposes. Or I can imagine there are easier ways to obtain the same information.

The current trend in libsoup is to use the stream infrastructure instead
of the SoupMessage signals. One example of using the network raw data is
the SoupCache that caches it on disk.

> 2) https://bitbucket.org/watchmouse/libsoup/commits/0a1b41879e39e216b61cadc56c320661e3364566
>
> A SoupSession 'connection-starting' event, analogous to 'connection-created', allowing the client to get a 
> sense of how much time was spent setting up the connection.
>
> Thirdly, I'm interested (but no patch yet) in being able to accurately measure the DNS lookup time per 
> connection created. However, we could use some guidance for the best implementation considering the async 
> case and and the recent DNS prefetching work.

I think what you need is to connect to the recently added SoupMessage's
"network-event" signal. It will allow you to properly measure things
like DNS resolution, TLS handshaking or proxy negotiation times.

BR