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RE: CVS slow and TCP Compression

From: Scott Willy
Subject: RE: CVS slow and TCP Compression
Date: Tue, 3 Jul 2001 12:31:12 +0200

We have re-done the FTP tests. Uploads and downloads work fine. Both to/from
the PC (the cvs client) and to/from the cobalt cube (cvs server). The speed
was fine over 100KBytes/sec. Still could be a duplex problem, but the
evidence is not clear.

We are still trying to figure out how to configure the cube's Ethernet
driver to force it into half-duplex mode (it is easy to do so on the PC).

Any case, we can leave it here. I think the most important thing to note is
that by changing the TCP compression level (e.g. -z3 )some network problems
might be solved (or at least worked around).


> -----Original Message-----
> From: address@hidden [mailto:address@hidden Behalf Of
> Gerhard Sittig
> Sent: 02 July 2001 20:47
> To: address@hidden
> Subject: Re: CVS slow and TCP Compression
> On Mon, Jul 02, 2001 at 12:54 +0200, Scott Willy wrote:
> >
> > Some more info...
> >
> > 1) Not sure its a duplex problem as FTP does not have this
> speed problem.
> >    I just downloaded 8MB in 37 seconds. One would think a duplex problem
> >    would affect all protocols.
> >    [8647568 bytes sent in 37.5 secs (2.3e+02 Kbytes/sec)]
> That's *download* which is not the same as transferring data in
> _both_ directions.  In FTP you only have small(!) handshake
> packets going both ways, while the main stuff flows in one
> direction only.
> > 4) By tons of collisions, I mean that the little blinky lite on
> the hub goes
> >    from not blinking to full-on when I start a cvs checkout.
> If this is not a sign for a duplex mismatch, what else is?
> Honestly:  Check your network setup!  If autonegotiation takes
> place, double check the results.  If autonegotiation won't work,
> hardcode things.  But do it consistently and do it everywhere!
> How about starting a log analyzer to see how traffic flows and
> what the timing looks like?
> virtually yours   82D1 9B9C 01DC 4FB4 D7B4  61BE 3F49 4F77 72DE DA76
> Gerhard Sittig   true | mail -s "get gpg key" address@hidden
> --
>      If you don't understand or are scared by any of the above
>              ask your parents or an adult to help you.
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