mbuf denied problem

[Peter J. Blok]

On Sunday 21 May 2006 21:28, Robert Watson wrote:
> On Sat, 20 May 2006, Robert Watson wrote:
> > On Fri, 19 May 2006, OxY wrote:
> >> i have a problem with mbuf... when all my free memory is gone ( i have
> >> 2gb ram) and memory allocation looks like this:
> >
> > I recently received an informal problem report that there is a problem
> > with the "denied" statistics gathering, so I think it's likely that's
> > what is going on here.  I'll follow up with the submitter and see if we
> > can't figure out something more definite.
>
> I have received some further information on the problem from the reporter.
> Could you give this patch a try and see what effect it has?
I already had made an identical patch and it worked.

This seems to be the problem.
>
> Index: uma_core.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/vm/uma_core.c,v
> retrieving revision 1.136
> diff -u -r1.136 uma_core.c
> --- uma_core.c	11 Feb 2006 19:20:56 -0000	1.136
> +++ uma_core.c	21 May 2006 19:25:56 -0000
> @@ -2413,8 +2413,7 @@
>   	 * If nothing else caught this, we'll just do an internal free.
>   	 */
>   zfree_internal:
> -	uma_zfree_internal(zone, item, udata, SKIP_DTOR, ZFREE_STATFAIL |
> -	    ZFREE_STATFREE);
> +	uma_zfree_internal(zone, item, udata, SKIP_DTOR, ZFREE_STATFREE);
>
>   	return;
>   }
>
> Technically, there has been an allocation failure in this case in
> identifying a bucket to return the item to, but since the overall case is a
> free, generating a failure statistics update seems undesirable.
>
> Thanks,
>
> Robert N M Watson
>
> > Robert N M Watson
> >
> >> Mem: 30M Active, 1607M Inact, 245M Wired, 84M Cache, 214M Buf, 3028K
> >> Free Swap: 695M Total, 695M Free
> >>
> >> mbuf starts to deny...
> >> netstat -m show 0 deny till has memory, after that i see this:
> >>
> >> Field root# netstat -m
> >> 629/466/1095 mbufs in use (current/cache/total)
> >> 512/176/688/65536 mbuf clusters in use (current/cache/total/max)
> >> 512/133 mbuf+clusters out of packet secondary zone in use
> >> (current/cache) 0/0/0/0 4k (page size) jumbo clusters in use
> >> (current/cache/total/max) 0/0/0/0 9k jumbo clusters in use
> >> (current/cache/total/max)
> >> 0/0/0/0 16k jumbo clusters in use (current/cache/total/max)
> >> 1181K/468K/1649K bytes allocated to network (current/cache/total)
> >> 7410219/101093/101499 requests for mbufs denied
> >> (mbufs/clusters/mbuf+clusters)
> >> 0/0/0 requests for jumbo clusters denied (4k/9k/16k)
> >> 0/0/0 sfbufs in use (current/peak/max)
> >> 0 requests for sfbufs denied
> >> 0 requests for sfbufs delayed
> >> 25288 requests for I/O initiated by sendfile
> >> 65 calls to protocol drain routines
> >>
> >> this is my sysctl.conf:
> >> net.inet.tcp.delayed_ack=0
> >> net.inet.ip.intr_queue_maxlen=400
> >> net.inet.tcp.inflight.enable=0
> >> net.route.netisr_maxqlen=512
> >> kern.ipc.somaxconn=1024
> >>
> >> should i attach any other conf/log,etc?
> >> thanks!
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