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

[Maciej Stachowiak <[e-mail]>]

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.

Regards,
Maciej