debugging a mbuf leak

John Hickey jhickey at ISI.EDU
Fri Nov 27 18:28:48 UTC 2009


Thanks for the reply.  We managed to track down the leak and have
submitted a PR (kern/140853) for it.

Thanks,
John

On Thu, Nov 26, 2009 at 04:07:26PM +0000, Bjoern A. Zeeb wrote:
> On Mon, 23 Nov 2009, John Hickey wrote:
>
> Hi John,
>
>> One of our main servers here has a slow mbuf leak.  We are not sure what
>> is causing it at this point.  Does anyone have some pointers on how to
>> dig further into this?
>
> There are a couple of things to check:
> 1) is it really a leak?
>
>    This can easily be tested by going down to single user and see
>    if the mbufs got freed again.
>
> 2) maybe starting with this first: which version of freebsd is this?
>
>
>> Mon Nov 23 13:19:15 PST 2009
>>
>> 16364/2836/19200 mbufs in use (current/cache/total)
>> 928/2216/3144/132096 mbuf clusters in use (current/cache/total/max)
>> 512/1664 mbuf+clusters out of packet secondary zone in use
>> (current/cache)
>> 0/135/135/66048 4k (page size) jumbo clusters in use
>> (current/cache/total/max)
>> 0/0/0/33024 9k jumbo clusters in use (current/cache/total/max)
>> 0/0/0/16512 16k jumbo clusters in use (current/cache/total/max)
>> 5947K/5681K/11628K bytes allocated to network (current/cache/total)
>> 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
>> 0/0/0 requests for jumbo clusters denied (4k/9k/16k)
>> 0/5/33280 sfbufs in use (current/peak/max)
>> 0 requests for sfbufs denied
>> 0 requests for sfbufs delayed
>> 0 requests for I/O initiated by sendfile
>> 0 calls to protocol drain routines
>>
>> Mon Nov 23 13:24:21 PST 2009
>>
>> 18085/2660/20745 mbufs in use (current/cache/total)
>> 923/2455/3378/132096 mbuf clusters in use (current/cache/total/max)
>> 512/1664 mbuf+clusters out of packet secondary zone in use
>> (current/cache)
>> 0/135/135/66048 4k (page size) jumbo clusters in use
>> (current/cache/total/max)
>> 0/0/0/33024 9k jumbo clusters in use (current/cache/total/max)
>> 0/0/0/16512 16k jumbo clusters in use (current/cache/total/max)
>> 6367K/6115K/12482K bytes allocated to network (current/cache/total)
>> 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
>> 0/0/0 requests for jumbo clusters denied (4k/9k/16k)
>> 0/5/33280 sfbufs in use (current/peak/max)
>> 0 requests for sfbufs denied
>> 0 requests for sfbufs delayed
>> 0 requests for I/O initiated by sendfile
>> 0 calls to protocol drain routines
>>
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>
> -- 
> Bjoern A. Zeeb         It will not break if you know what you are doing.


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