Re: Re Faster HTTP

Mary Morris (marym@Finesse.COM)
Thu, 7 Jul 1994 13:39:52 +0800

> > HTTP is just another TCP connection. How can your networking software
> > which round robins the connections tell the difference between this and
> > an FTP data connection ?
> >
> > I use serial networking to a Windows PC and do not see the problem you
> > mentioned above. Perhaps it is related to your flavor of networking
> > software ?
> My guess is she is using WinMosaic on a machine with less than 16MB of RAM.
> The pauses are common if the client (Win) machine has, say, 8MB of RAM, and
> is receiving a moderately complex document of 30KB or more in length.

Actually this is a Solaris 2.3-sparc2 setup with Solaris's PPP and Mosaic 2.4.
The system has 32M of memory. I have
watched the modem. There are long pauses where there isn't any
activity on the modem.

It is interesting to note that the complexity of the html page has little
to do with it. In addition, ftp via Mosaic is very problematic.
I tend to succeed in downloading about 60-70% of the time. However,
straight anon ftp doesn't display this problem.

I agree that they both use *should* behave the same.
In reality they don't. I can snoop the PPP line and save the
traffic, but I have no idea what to look for. Can someone
give me some hints here?

> On my 386 notebook with 8MB, receiving the WinMosaic "What's New" page
> (>100K in length), using PPP, I watch the modem lites, and see that it is
> the client that is taking a LONG time to send ACKs. Like 30 sec. after
> receiving 60K or so. The entire process takes 10-15 minutes! Meanwhile, the
> disk is thrashing to beat hell from the pagefaulting.

Mary Morris