<s>
The	O
Sockets	B-Protocol
Direct	I-Protocol
Protocol	I-Protocol
(	O
SDP	O
)	O
is	O
a	O
transport-agnostic	O
protocol	O
to	O
support	O
stream	O
sockets	O
over	O
remote	B-General_Concept
direct	I-General_Concept
memory	I-General_Concept
access	I-General_Concept
(	O
RDMA	B-General_Concept
)	O
network	B-Architecture
fabrics	I-Architecture
.	O
</s>
<s>
SDP	O
was	O
originally	O
defined	O
by	O
the	O
Software	O
Working	O
Group	O
(	O
SWG	O
)	O
of	O
the	O
InfiniBand	B-Architecture
Trade	I-Architecture
Association	I-Architecture
.	O
</s>
<s>
Originally	O
designed	O
for	O
InfiniBand	B-Architecture
(	O
IB	O
)	O
,	O
SDP	O
is	O
currently	O
maintained	O
by	O
the	O
OpenFabrics	B-General_Concept
Alliance	I-General_Concept
.	O
</s>
<s>
SDP	O
defines	O
a	O
standard	O
wire	O
protocol	O
over	O
an	O
RDMA	B-General_Concept
fabric	O
to	O
support	O
stream	O
sockets	O
(	O
SOCK_STREAM	O
)	O
.	O
</s>
<s>
SDP	O
uses	O
various	O
RDMA	B-General_Concept
network	O
features	O
for	O
high-performance	O
zero-copy	O
data	O
transfers	O
.	O
</s>
<s>
The	O
purpose	O
of	O
the	O
Sockets	B-Protocol
Direct	I-Protocol
Protocol	I-Protocol
is	O
to	O
provide	O
an	O
RDMA-accelerated	O
alternative	O
to	O
the	O
TCP	B-Protocol
protocol	I-Protocol
on	O
IP	B-Protocol
.	O
</s>
<s>
Solaris	B-Application
10	I-Application
and	O
Solaris	B-Application
11	I-Application
Express	O
include	O
support	O
for	O
SDP	O
.	O
</s>
<s>
Several	O
other	O
Unix	O
operating	O
system	O
variants	O
plan	O
to	O
include	O
support	O
for	O
Sockets	B-Protocol
Direct	I-Protocol
Protocol	I-Protocol
.	O
</s>
<s>
Windows	O
offers	O
a	O
subsystem	O
called	O
Winsock	B-Application
Direct	O
,	O
which	O
could	O
be	O
used	O
to	O
support	O
SDP	O
.	O
</s>
<s>
SDP	O
support	O
was	O
introduced	O
to	O
the	O
JDK	O
7	O
release	O
of	O
the	O
Java	O
Platform	O
,	O
Standard	O
Edition	O
(	O
July	O
2011	O
)	O
for	O
applications	O
deployed	O
in	O
on	O
Solaris	B-Application
and	O
Linux	B-Application
operating	I-Application
systems	I-Application
(	O
OFED	O
1.4.2	O
and	O
1.5	O
)	O
.	O
</s>
<s>
Sockets	B-Protocol
Direct	I-Protocol
Protocol	I-Protocol
only	O
deals	O
with	O
stream	O
sockets	O
,	O
and	O
if	O
installed	O
in	O
a	O
system	O
,	O
bypasses	O
the	O
OS	O
resident	O
TCP	B-Protocol
stack	O
for	O
stream	O
connections	O
between	O
any	O
endpoints	O
on	O
the	O
RDMA	B-General_Concept
fabric	O
.	O
</s>
<s>
are	O
supported	O
by	O
the	O
Linux	B-Application
IP	B-Protocol
stack	O
and	O
operate	O
over	O
standard	O
IP	B-Protocol
interfaces	O
(	O
i.e.	O
,	O
IPoIB	O
on	O
InfiniBand	B-Architecture
fabrics	O
)	O
.	O
</s>
<s>
The	O
IP	B-Protocol
stack	O
has	O
no	O
dependency	O
on	O
the	O
SDP	O
stack	O
;	O
however	O
,	O
the	O
SDP	O
stack	O
depends	O
on	O
IP	B-Protocol
drivers	O
for	O
local	O
IP	B-Protocol
assignments	O
and	O
for	O
IP	B-Protocol
address	O
resolution	O
for	O
endpoint	O
identifications	O
.	O
</s>
<s>
SDP	O
is	O
used	O
by	O
the	O
Australian	O
telecommunications	O
company	O
Telstra	O
on	O
their	O
3G	B-Architecture
platform	O
Next	O
G	O
to	O
deliver	O
streaming	O
mobile	O
TV	O
.	O
</s>
<s>
The	O
probable	O
suggestions	O
will	O
be	O
RSocket	B-Protocol
,	O
Winsock	B-Application
,	O
etc	O
.	O
</s>
