<s>
TCP	B-Protocol
delayed	I-Protocol
acknowledgment	I-Protocol
is	O
a	O
technique	O
used	O
by	O
some	O
implementations	O
of	O
the	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
in	O
an	O
effort	O
to	O
improve	O
network	O
performance	O
.	O
</s>
<s>
Delayed	O
ACKs	O
can	O
give	O
the	O
application	O
the	O
opportunity	O
to	O
update	O
the	O
TCP	B-Protocol
receive	I-Protocol
window	I-Protocol
and	O
also	O
possibly	O
to	O
send	O
an	O
immediate	O
response	O
along	O
with	O
the	O
ACK	O
.	O
</s>
<s>
For	O
certain	O
protocols	O
such	O
as	O
Telnet	B-Protocol
,	O
delayed	O
ACKs	O
can	O
reduce	O
the	O
number	O
of	O
responses	O
sent	O
by	O
the	O
server	O
by	O
a	O
factor	O
of	O
3	O
,	O
by	O
combining	O
the	O
ACK	O
,	O
window	O
update	O
and	O
the	O
response	O
data	O
into	O
one	O
segment	O
.	O
</s>
<s>
If	O
Nagle	B-Protocol
's	I-Protocol
algorithm	I-Protocol
is	O
being	O
used	O
by	O
the	O
sending	O
party	O
,	O
data	O
will	O
be	O
queued	O
by	O
the	O
sender	O
until	O
an	O
ACK	O
is	O
received	O
.	O
</s>
<s>
If	O
the	O
sender	O
does	O
not	O
send	O
enough	O
data	O
to	O
fill	O
the	O
maximum	B-Protocol
segment	I-Protocol
size	I-Protocol
(	O
for	O
example	O
,	O
if	O
it	O
performs	O
two	O
small	O
writes	O
followed	O
by	O
a	O
blocking	O
read	O
)	O
then	O
the	O
transfer	O
will	O
pause	O
up	O
to	O
the	O
ACK	O
delay	O
timeout	O
.	O
</s>
<s>
Per	O
Nagle	B-Protocol
's	I-Protocol
algorithm	I-Protocol
,	O
it	O
will	O
not	O
be	O
sent	O
until	O
he	O
receives	O
an	O
ACK	O
for	O
the	O
data	O
that	O
has	O
already	O
been	O
sent	O
.	O
</s>
<s>
Alternatively	O
,	O
Nagle	B-Protocol
's	I-Protocol
algorithm	I-Protocol
may	O
be	O
disabled	O
by	O
the	O
application	O
on	O
the	O
sending	O
side	O
.	O
</s>
