Phinux Zhang wrote:
Hello
Does anybody know how to change TCP window size in tomcat configuration?
It's strange that we can get about 200 KB/s bandwidth when downloading from
FTP service, but it's just about 45 KB/s bandwidth from tomcat service
located on the same server. I doubt it's a problem a TCP window size, maybe
we can improve the speed by changing the windows size.
Thanks in advance for any advices. Please let me know if you need any more
information.
If you want to get some relevant answers, I suggest that you provide
much more information about what you are really doing, what you are
comparing, and how you obtain your bandwidth figures above.
At the general level, I would tend to think that FTP is a program whose
main function is to download/upload files, while Tomcat is a servlet
engine; so it is no wonder if FTP would be somewhat more efficient if
you compare purely on the base of one large file download.
FTP is probably full of tricks to manipulate the window size and packet
size dynamically, in function of the link performance at any point in
time. Tomcat being a much more generic piece of software, I doubt it
would include the same kind of logic.
I would also think that, TCP window size being a parameter down at the
socket level, it would be surprising if Tomcat itself had a
configuration parameter for this. Maybe you will find one at the jvm
level, or maybe you can, in your application, drill down to the java
Socket level and set it there.
This being said, I doubt very much that your problem would be at that level.
Another suggestion : set up a comparison between Apache HTTPD and
Tomcat, both delivering a page with a http link to the file you want to
download, compare those, and post your comparison here. That would be a
much more relevant comparison.
And if you don't get much of a difference that way, then you have your
answer already.
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