hello,
thanks to reply.
but by my test, if my cpu not slow when I use buffer
32kb to send 50MB file only cost 13Mins,
with 8kb it must cost almost 20Mins.
It not always can up to max speed, but maybe better
for slow cpu works.
--- Francois Piette [EMAIL PROTECTED] 說：
Actully, the buffer size you use to transmit receive
is not critical at all. It has to be large
enoug in orther to not have too much OnDataSent or
OnDataAvailable events triggeres which would
consume CPU and in case you have a slow CPU, you
couldn't sustain the line speed when the line speed
is high (such as Gigabit). If the buffer is too
large, it is simply a waste on memory.
In the http component, the buffer is used in a way
that the maximum header line must fit into the
receive buffer. A part from that, the buffer could
be reduce without significant impact.
To send files, it is better to have a buffer which
is a multiple of the maximum packet size (MTU).
But if you have several physical layers (LAN and PPP
for example), it is difficult to adjust the
buffer size dynamically. All in all, 4KB is a good
value in most situations.
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Author of ICS (Internet Component Suite, freeware)
Author of MidWare (Multi-tier framework, freeware)
http://www.overbyte.be
- Original Message -
From: David A. G. [EMAIL PROTECTED]
To: twsocket@elists.org
Sent: Tuesday, January 17, 2006 1:44 AM
Subject: [twsocket] Buffer size
Hello all, sorry if this topic was posted some
times.
I making a protocol to transfer files via TCP
using a mixed mode (binary and
text).
I searched in ICS Components for the better buffer
size:
in HTTP protocol I found HTTP_SND_BUF_SIZE = 8193
I made tests and this value works great for LAN
transferences but using
internet I (through some linux routers) got blocks
always minor than 1423
bytes.
I'm doing something bad if I still using 8193 ?
(Delphi 7, WinXP)
thanks
David
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