[Spice-devel] Untested idea: enlarge the TCP send buffer (server), receive buffer (client)

[Yonit Halperin]

On 02/13/2012 10:47 PM, Yaniv Kaul wrote:
> For both LAN (high bandwidth, high performance) and WAN (high latency)
> perhaps it may be worthwhile to increase (via socket options) the TCP
> receive (on the client) and send (on the server) buffers for the display
> channel? It will cause:
> - bigger TCP window (which is good for both cases above)
> - some waste of memory (negligible, I think it's enough to increase to
> 256K or so for each).
>
Hi,
I've started investigating it a bit, but from spice network captures I 
didn't see that the window size is a limiting factor. In all of the 
scenarios I saw, the windows was big enough during all the session . I 
don't recall many cases in which the available window size was close to 
zero. Still, I didn't completed testing this and we do plan to add 
options to configure the window size and test how it affects different 
scenarios.

> I suspect it might make a difference especially in video streaming.
>
btw, I've started to work on moving the video to udp.

> It's a simple patch (I hope - via setsockopt() ) and does not require
> feature negotiation, but I'm not sure I have the tools to test such change.
>
> Thoughts?
> Y.
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