ixgbe(4) and "Could not setup receive structures"

[Leon Meßner]

On Thu, Apr 14, 2011 at 08:55:17PM +0200, K. Macy wrote:
> That isn't guaranteed to work if he is KVA limited.
> 
> On Thu, Apr 14, 2011 at 6:44 PM, Jack Vogel <jfvogel at gmail.com> wrote:
> > If you get this message its only for one reason, you don't have enough mbufs
> > to
> > fill your rings. You must do one of two things, either reduce the number of
> > queues,
> > or increase the relevant mbuf pool.
> >
> > Increase the 9K mbuf cluster pool.

I did set it to twice the default, and now it works and netstat -m 
shows:
 
8192/391/8583/12800 9k jumbo clusters in use (current/cache/total/max)
  
Whats a reasonable amount to set kern.ipc.nmbjumbo9 to and is there
any
form of auto-tuning (i have absolutely no load on this machine and
mbufs
are higher than default pool size).
   
Thanks to all,
Leon

> > On Thu, Apr 14, 2011 at 6:05 AM, Leon Meßner
> > <l.messner at physik.tu-berlin.de>wrote:
> >
> >> Hi,
> >>
> >> i tried setting the mtu on one of my ixgbe(4) intel NICs to support
> >> jumbo frames. This is on a box with RELENG_8 from today.
> >>
> >> # ifconfig ix0 mtu 9198
> >>
> >> I then get the following error:
> >>
> >> # tail -n 1 /var/log/messages
> >> Apr 14 12:48:43 siloneu kernel: ix0: Could not setup receive structures
> >>
> >> I already tried the following patch because of Jack Vogel's advice given
> >> in the following thread on -stable in Oct. last year, which still
> >> produces the same error message and leaves the box unpingable:
> >>
> >> http://lists.freebsd.org/pipermail/freebsd-stable/2010-October/059541.html
> >>
> >> # cat ~/patches/ixgbe.num_queues_to_4.patch
> >> --- /root/.vimbackup/ixgbe.c~   2011-04-12 22:14:27.000000000 +0000
> >> +++ sys/dev/ixgbe/ixgbe.c       2011-04-12 22:14:27.000000000 +0000
> >> @@ -273,7 +273,7 @@ TUNABLE_INT("hw.ixgbe.hdr_split", &ixgbe
> >>  * number of cpus. Each queue is a pair
> >>    * of RX and TX rings with a msix vector
> >>      */
> >>      -static int ixgbe_num_queues = 0;
> >>      +static int ixgbe_num_queues = 4;
> >>       TUNABLE_INT("hw.ixgbe.num_queues", &ixgbe_num_queues);
> >>
> >>         /*
> >>
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