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Re: CVS slowness issues

From: Larry Jones
Subject: Re: CVS slowness issues
Date: Fri, 15 Jun 2001 11:27:21 -0400 (EDT)

Ryan Petrie writes:
> I'm not entirely sure this is CVS-specific, but I can't get anything else 
> to be as slow, so I'll ask here.

What other things have you tried?

> The network usage is waaaay low, and the route to the server through the 
> internet is still only three jumps from here with a ping time under 10 ms. 
>  The machine seems completely idle in top, and cvs just sits there using a 
> meg or two of memory and doing nothing.  Sometimes it can finish a diff or 
> an update in a few minutes on a 100k text file, but other times it never 
> seems to finish.  Other applications use the internet just fine, topping 
> out our SDSL connection easily.

It sure sounds like some kind of network problem.  Specifically, it
sounds like you're experiencing massive packet loss, although why it
would only affect CVS, I can't say.  Is it possible that CVS sends lots
of packets whereas the other applications that work fine receive lots of
packets but don't send many (e.g., web browsers work that way).  Have
you checked your network statistics for errors and retransmissions (see
netstat)?  If you can, checking the statistics at the next hop might be
useful, too.  Is your network connection twisted pair?  If so, make sure
that both ends agree on duplex: have one end set to full duplex and the
other end set to half duplex will cause massive collisions under some
circumstances and might well explain the behavior you're seeing.

-Larry Jones

I must have been delirious from having so much fun. -- Calvin

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