[3325] in linux-net channel archive
Re: Locked Network Buffers, Emerging Technologies, and Dummy modules
daemon@ATHENA.MIT.EDU (Dennis)
Wed Jun 19 03:28:14 1996
Date: Tue, 18 Jun 1996 18:16:45 -0400
To: Andrew Stanley-Jones <asj@cban.com>
From: dennis@etinc.com (Dennis)
Cc: linux-net@vger.rutgers.edu
>Hi,
>
> I've been dealing with Dennis at Emerging Technologies trying to
>solve a problem I began having after installing his Sync card and using
>the Dummy module under linux 1.2.13.
>
>Desc:
>
>cban.cban.com routes a 64k sync ISDN line. It also servers WWW traffic
>for 7 virtual domains. (Apache httpd)
>
>
>Problem:
>
>As the machine runs it accumulates locked network buffers. At the same
>time the "Total free while locked events" matches the number of locked
>network buffers exactly.
>
>
>Trouble shooting:
>
>For the virtual domains I simply load the dummy module 7 times.
>(/sbin/insmod dummy -o dummy0). I setup a test machine running under very
>similar conditions, except without Emerging Tech's sync card, and there
>were no problems. Ran for a day and served 100,000 hits. No locked
>buffers, nothing.
>
>It looked like the dummy modules were ok so trying to isolate the problem
>I moved the virtual WWW servers off of cban.cban.com on the test machine.
>When I did this though, all the locked network buffers stopped growing.
>
>So it seemed that Emerging Technologies driver was working ok by itself.
>
>With the combination of Emerging Tech's card and the dummy modules the
>problem appears.
>
>Dennis can't solve the problem, and he doesn't think it's his driver. He
>beleives it's something to do with the dummy modules and how they
>operate.
I didnt say that. I said that we cant duplicate the problem (yet), and getting
pointers on what possible interactions there are with the dummy module
present would be helpful.
>
>I've tried 2.0.0 as well, and the problem seemed to be there as well.
>Unfortunatly, I cannot provide much information because Dennis' beta
>module for 2.0.0 crashes within a couple a few minutes. (nor do I know
>if IP aliases solve the problem)
try v2.3beta2. The crash problem is fixed, I believe ( a parameter change
in the hard_header routine was the culprit). Hopefully you can get some
better stats now.....
Dennis
----------------------------------------------------------------------------
Emerging Technologies, Inc. http://www.etinc.com
Synchronous Communications Cards and Routers For
Discriminating Tastes. 56k to T1 and beyond. Frame
Relay, PPP, HDLC, and X.25 for BSD/OS, FreeBSD
and LINUX
