Sudden mbuf demand increase and shortage under the load
dudu at dudu.ro
Sat Jul 10 17:09:14 UTC 2010
On Tue, Feb 16, 2010 at 7:23 PM, Maxim Sobolev <sobomax at freebsd.org> wrote:
> Miroslav Lachman wrote:
>> Can it be related to this issue somehow?
>> It was tested on FreeBSD 8 and high UDP traffic on igb interfaces emits
>> messages "GET BUF: dmamap load failure - 12" and later results in kernel
>> We have not received any response to this report.
> Could be the issue, however in our case there is no panic, just that all
> userland activity in the system ceases for 2 minutes after it reaches
> certain network load level.
Sorry for digging into this old thread, but I'm seeing similar
symptoms with today's RELENG_8 and bge(4) attached to BCM5721, on an UP system.
kern.ipc.nmbclusters is 65536, but what strikes me odd is this:
0/115446003/57722999 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
vmstat -i shows a rate of 1100 for the adapter.
The machine runs a fairly small PF configuration, but I've already
ruled it out, the symptoms appear when PF is disabled as well.
I'll happily provide more info.
Good, fast & cheap. Pick any two.
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