On Mon, Apr 13, 2009 at 11:27 PM, Giuseppe Scrivano
<address@hidden> wrote:
Hi,
> I have problems using sendfile over SCTP :(
>
> Did you tried it already?
I haven't tried it yet but I thought it wasn't working properly when
multiple streams are available. Which version of the linux kernel are
you using? `sendfile' itself is a recent feature, without it I
seriously doubt SCTP can reach the performance of static files sent over
TCP.
I think sendfile is a great feature but, we are not replacing TCP so sendfile will be
available for TCP transport.
On the other hand, as I said in that paper, up until now, optimizations were made
in application software like this sendfile OS feature while using this new transport
we are trying to improve the performance other places: at transport layer.
On the other hand this feature is marginal to our server because it's not available on
windows and used just by HTTP(S).
Did you measure into an real world environment how myserver's performs using
sendfile vs. not using this feature? Or do you know studies that show how much
gain ones can have using sendfile instead read/send? Because I think in Internet
the real server's botleneck is not the processor's power but the number of connections
the server(as a whole: user and kernel spaces) can handle concurrently.
SCTP helps me to handle more connections concurrently.
So, I'm optimistic about using SCTP even without sendfile.
Anyway, I think the design of myserver is great(although it can be improved) and it'll
let's us integrate both transports.
Andu.
Giuseppe