mbuf denied problem

[Robert Watson]

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?

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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