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Re: NMBCLUSTERS warning - sysctl fix?
On Mon, Mar 24, 2008 at 08:02:58PM -0500, Donald Lee wrote:
> I got a brief hang today on my production server running NetBSD 2.1 PPC:
> Mar 24 13:57:07 mercy /netbsd: WARNING: mclpool limit reached; increase
> Mar 24 13:58:07 mercy /netbsd: WARNING: mclpool limit reached; increase
> Mar 24 14:00:08 mercy last message repeated 2 times
> Mar 24 14:05:09 mercy last message repeated 5 times
> In the NetBSD docs, there is some advice:
> What I have done is set up /etc/sysctl.conf, and put:
> # Server gets busy sometimes. Bump up network resources
> # number of "mbuf clusters"? Default of 1024 too small.
> in it. This seems to work fine, but I apparently have to bump it up again.
> The docs (above) suggest the "sysctl -w", and also suggest patching the
> kernel. At the end of the section it says:
> Combining this, and patching the binary, would mean no need to
> build a new kernel or reboot.
> Is there some reason that the sysctl.conf approach is insufficient? Do I need
> to set sysctl *and* patch the kernel for some reason?
It depends on how the MCL pool is implemented on a particular architecture.
Some can grow it on the fly, come can't. I think alpha can grow
it on the fly (so the sysctl method will work) but i386/amd64 can't
(so need the kenrel patch method). I don't know in which category
macppc is though, but sysctl -w should return you an error if
it can't be grown on the fly.
Manuel Bouyer, LIP6, Universite Paris VI.
NetBSD: 26 ans d'experience feront toujours la difference
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