Date: Sat, 03 Nov 2001 16:22:48 +0100 From: Trond Davidsen <trond.davidsen@ii.uib.no> To: Archie Cobbs <archie@dellroad.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Mpd with a large number, 200+ , of bundles Message-ID: <3BE40BC8.9060504@ii.uib.no> References: <200110301602.f9UG2gr07609@arch20m.dellroad.org>
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Archie Cobbs wrote:
>
> 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:
>
When I try to make 240 bundles, from the log, it seems mpd is makeing
all the nodes ok, but when I try to establish a connection nothing
happens, no respons, nothing in the log, and mpd is frozen and needs to
be killed with kill -9. And then it leaves 720 nodes behind which needs
to be removed manually.
>
> 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..
>
vpn-gw3# ngctl -d -d -d
Available commands:
config get or set configuration of node at <path>
connect Connects hook <peerhook> of the node at <relpath> to <hook>
debug Get/set debugging verbosity level
help Show command summary or get more help on a specific command
list Show information about all nodes
mkpeer Create and connect a new node to the node at "path"
msg Send a netgraph control message to the node at "path"
name Assign name <name> to the node at <path>
read Read and execute commands from a file
rmhook Disconnect hook "hook" of the node at "path"
show Show information about the node at <path>
shutdown Shutdown the node at <path>
status Get human readable status information from the node at <path>
types Show information about all installed node types
quit Exit program
+ list
ngctl: SENDING MESSAGE:
ngctl: SOCKADDR: { fam=32 len=4 addr="." }
ngctl: NG_MESG :
ngctl: vers 2
ngctl: arglen 0
ngctl: flags 0
ngctl: token 1
ngctl: cookie GENERIC (851672668)
ngctl: cmd 9
ngctl: args (0 bytes)
ngctl: sendto(.): No buffer space available
ngctl: send msg: No buffer space available
+
When I create 240 bundles, mpd creates 720 netgraph nodes.
Is there a limit on how many nodes the netgraph system can handle?
Where is the netgraph system defined? i can find the modules under
/usr/src/sys/modules/netgraph, but I can't find the 'netgraph base system'.
Trond
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