Re: [hybi] Background info: Properties of sendfile()

[Willy Tarreau <[e-mail]>]

On Fri, Aug 06, 2010 at 02:08:28AM -0700, Maciej Stachowiak wrote:
> 
> On Aug 5, 2010, at 11:29 PM, Willy Tarreau wrote:
> 
> > On Thu, Aug 05, 2010 at 06:47:48PM -0700, Roberto Peon wrote:
> >> Thus my statement of "theoretical" benefits.
> >> I've not seen the benefits of either splice or sendfile yet.
> > 
> > At least I've seen it. Haproxy happily forwards traffic at 10 Gbps
> > with only 25% of one CPU core on a 2.66 GHz Core2Duo using splice().
> > And some file sharing sites make a big use of it ! Without splice,
> > it hardly achieves 10 Gbps at 100% CPU.
> > 
> > Anyway, it's unclear to me why we would need to send large amounts
> > of data over WebSockets. File serving could well be performed by
> > the web server itself.
> 
> I already cited the use case of sync. It's likely that in a case like filesystem sync or media sync, large data objects will be sent in both directions, and it will likely be advantageous to send them over WebSocket rather than using a separate HTTP exchange for each file transfer.

Ah that's a good example. I didn't see your mail, but I agree that it
would be a suited case of massive data exchange.

Regards,
Willy