Date: Thu, 25 Mar 1999 14:03:08 -0800 (PST) From: Jesse <j@lumiere.net> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: freebsd-net@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: 3.1-STABLE dies on 40+ connects Message-ID: <Pine.BSF.4.05.9903251359140.338-100000@leaf.lumiere.net> In-Reply-To: <199903251903.UAA13471@labinfo.iet.unipi.it>
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> i trust you -- i suspect there is some piece of the code somewhere
> which does not check for mcopy/mpullup/etc failures.
>
> in fact it would be nice to know if there is some reproducible way to
> trigger these crashes because i think this is a problem that ought to
> be fixed in a better way than overallocating resources.
Okay, I updated the NMBCLUSTERS to 4096. This allowed me to get 40 clients
on successfully. Here's an netstat -m with 40 clients connected:
leaf:~# netstat -m
1076/1792 mbufs in use:
1025 mbufs allocated to data
51 mbufs allocated to packet headers
1023/1620/4096 mbuf clusters in use (current/peak/max)
3464 Kbytes allocated to network (62% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
So I tried 60 clients. It crashed after the 56 client connected. I was
doing netstat -m the entire time until the moment it crashed. The last one
showed:
leaf:~# netstat -m
4637/4704 mbufs in use:
4565 mbufs allocated to data
72 mbufs allocated to packet headers
4564/4604/4096 mbuf clusters in use (current/peak/max)
9796 Kbytes allocated to network (99% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
So it definitely appears to be an mbuf issue.
Is it normal for something to use mbuf's so quickly? Each client is being
sent a 128kbps stream. I know sites like ftp.cdrom.com transfer MUCH more
than this per second.. soo..
It'd of course be nicer to see FreeBSD be 'fixed' to not crash in this
situation, but is there anything that the authors of icecast can do to
help reduce their mbuf usage?
Lastly, is it safe to raise my nmbclusters higher than 4096? Like 10000?
What are the downsides?
---
Jesse <j@lumiere.net>
http://www.lumiere.net/
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