Thanks to whoever has been following this. dwh, your pet theory about maximum packet size is right.
This explains it. http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q294769&; > -----Original Message----- > From: Saravanan Bellan [mailto:[EMAIL PROTECTED]] > Sent: Thursday, July 25, 2002 2:46 PM > To: 'Tomcat Users List' > Subject: RE: localhost vs IP address in the URL > > > > > > > > I'm not a networking guru, (and this is sort of OT for > > Tomcat) but I'm not > > convinced by M.Schwartz's response that this is due solely > to DNS name > > resolution. I don't think that would account for such a big > > difference in > > time--once the name was resolved to the IP address, behavior > > should be the same, > > no? > > > > Saravanan, you say there's a 20x difference but what's the > > magnitude? Are we > > talking 10 ms vs. 200 ms. or 1 second vs 20 seconds? By "IP > > address" do you mean > > "127.0.0.1" or the IP address of the computer? > > If it takes about 10 seconds when using the IP address/hostname, > then it takes more than 5 minutes when using localhost/127.0.0.1 > > By IP address I mean the Network IP address of the machine, > not 127.0.0.1 > > > > > My pet theory is that the TCP/IP stack is recognizing the IP > > address as being of > > the local box and is "shortcutting" packets from transmit > > queues to receive > > queues in memory, without actually getting the NIC involved > > or anything. Or > > maybe the NIC is doing this. > > > > Many years ago when I did hardware testing, we first ran into > > TCP/IP stacks that > > had this optimization. > > > > The other thought is that for some reason different maximum > > packet sizes are > > being used with these different connections? > > > > Of course, this is just a theory. Someone with a little more > > knowledge might be > > able to speak more authoritatively <grin>. > > > > dwh > > > > > > Saravanan Bellan wrote: > > > > > Windows 2000 > > > Tomcat 3.2.3 > > > > > > If I try to upload a file using the regular HTML/HTTP, > > there is a 20x > > > difference in performance > > > between using localhost vs the IP address in the Web Server > > URL. Ofcourse > > > I'm running the browser > > > on the same machine where tomcat is installed. Using > > localhost is 20 times > > > slower than using IP address. > > > > > > Doesnt make a difference if I use Apache/AJP/Tomcat or > > Direct to Tomcat web > > > server. > > > > > > Can somebody throw some light on this. > > > > > > Thanks, > > > > > > -- > > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
