Date: Tue, 30 Oct 2001 08:02:42 -0800 (PST) From: Archie Cobbs <archie@dellroad.org> To: Trond Davidsen <trond.davidsen@ii.uib.no> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Mpd with a large number, 200+ , of bundles Message-ID: <200110301602.f9UG2gr07609@arch20m.dellroad.org> In-Reply-To: <3BD6FA2F.6070509@ii.uib.no> "from Trond Davidsen at Oct 24, 2001 07:28:15 pm"
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Trond Davidsen writes:
> I'm trying to set up mpd as a replacement for poptop + ppp. But I run
> into a problem when I try to configure more than 100 bundles. When I
> configure 30 bundles, everything works nicely. When I configure 100
> bundles, things seems to work nicely, but when I run ngctl, I get the
> following error when typing 'list' at the ngctl prompt:
>
>
> [lines for ng100 - ng24 removed]
>
> Name: ng23 Type: iface ID: 00000849 Num hooks: 1
> Name: <unnamed> Type: socket ID: 00000848 Num hooks: 2
> Name: <unnamed> Type: vjc ID: 00000847 Num hooks: 4
> Name: <unnamed> Type: bpf ID: 00000846 Num hooks: 3
> Name: mpd37379-pptp12 Type: ppp ID: 00000845 Num hooks: 6
One problem with netgraph is that node and hook names can only be about 15
characters.. so when you get to 100 bundles, the hook names start
overflowing the buffers.
If you're only running one version of mpd, for example, you can
try this patch to fix the '100 bundles' problem by shortening
the node names:
Index: ngfunc.c
===================================================================
RCS file: /home/cvs/archie/mpd/src/ngfunc.c,v
retrieving revision 1.2
diff -u -r1.2 ngfunc.c
--- ngfunc.c 2001/04/12 17:03:33 1.2
+++ ngfunc.c 2001/10/30 15:58:46
@@ -189,7 +189,7 @@
newPpp = 1;
/* Give it a name */
- snprintf(nm.name, sizeof(nm.name), "mpd%d-%s", getpid(), b->name);
+ snprintf(nm.name, sizeof(nm.name), "mpd-%s", b->name);
if (NgSendMsg(b->csock, MPD_HOOK_PPP,
NGM_GENERIC_COOKIE, NGM_NAME, &nm, sizeof(nm)) < 0) {
Log(LG_ERR, ("[%s] can't name %s node: %s",
> + list
> ngctl: send msg: No buffer space available
> + quit
>
> which buffer is this, and how do I make it larger?
This is probably due to a fixed size buffer in the base netgraph
code somewhere... it doesn't look like libnetgraph can generate
an ENOBUFS on its own. Try running ngctl with one or more '-d' flags..
-Archie
__________________________________________________________________________
Archie Cobbs * Packet Design * http://www.packetdesign.com
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