Date: Fri, 19 Nov 2004 22:42:08 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Chris McDermott <chris.trismegistus@gmail.com> Cc: amd64@freebsd.org Subject: Re: Too many mbufs Message-ID: <20041119204208.GA92096@ip.net.ua> In-Reply-To: <bf8d7e4904111912214a86a151@mail.gmail.com> References: <Pine.BSF.4.60.0411191757010.75856@mail.sbb.co.yu> <20041119124946.J29849@area51.capnet.state.tx.us> <bf8d7e4904111912214a86a151@mail.gmail.com>
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On Fri, Nov 19, 2004 at 03:21:44PM -0500, Chris McDermott wrote:
> > Would you people please include at least a `uname -a`
> > with these posts, even better state the motherboard
> > you're running with. I am NOT seeing this with
> > a Tyan s2882, dual 244, with 4GB memory, on 5.3-R #0.
>
> I'm having the same problem, and it seems to be related to
> kern.ipc.mbstat. I don't see kern.ipc.mbstat in the output of sysctl
> -a.
>
You'd need "sysctl -ax" to print it.
> If I try and get the value with sysctlbyname() [copied from
> netstat/mbuf.c], it returns negative values for mbstat->m_mbufs. This
> negative value does fluctuate with network usage though...
>
> Test code:
>
> #include <sys/types.h>
> #include <sys/param.h>
> #include <sys/sysctl.h>
> #include <sys/mbuf.h>
> #include <stdio.h>
>
> int main()
> {
> struct mbstat *mbstat;
> size_t mlen;
>
> mlen = sizeof *mbstat;
> if( (mbstat = calloc(1,mlen)) == NULL)
> perror("calloc");
>
> if (sysctlbyname("kern.ipc.mbstat", mbstat, &mlen, NULL, 0) < 0)
> perror("sysctl: retrieving mbstat");
>
> printf("mbufs: %d \nclusters: %d\n", mbstat->m_mbufs, mbstat->m_mclusts);
>
> return 0;
> }
>
Your code is broken. Both m_mbufs and m_mclusts are of the type
u_long, so they should be printed with "%lu" specifier. Fix your
program and try again. (And you should see the same big number.)
> Output:
>
> mbufs: -2240
> clusters: -2686
>
> System:
>
> TYAN s2885 dual 242 512M ram 5.3-R
>
> codefactory# uname -a
> FreeBSD codefactory 5.3-RELEASE FreeBSD 5.3-RELEASE #7: Tue Nov 9
> 23:28:53 EST 2004
> cmc@codefactory:/usr/src/sys/amd64/compile/CODEFACTORY amd64
>
> codefactory# netstat -m
> 18446744073709549940 mbufs in use
> 18446744073709549630/17152 mbuf clusters in use (current/max)
> 0/0/0 sfbufs in use (current/peak/max)
> 18014398509477593 KBytes allocated to network
> 0 requests for sfbufs denied
> 0 requests for sfbufs delayed
> 0 requests for I/O initiated by sendfile
> 0 calls to protocol drain routines
Cheers,
--
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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