Re: problems with em(4) since update to driver 7.2.2

If you get "cannot setup receive structures" you cannot go on and try to
use the thing :) It means you have inadequate mbuf clusters to setup
your receive side, you simply have to increase it and reload the driver.

Jack


On Wed, Apr 27, 2011 at 5:39 AM, Olivier Smedts <olivier_at_gid0.org> wrote:

> 2011/3/31 Jack Vogel <jfvogel_at_gmail.com>:
> > This problem happens for only one reason, you have insufficient mbufs to
> > fill your rx ring. Its odd that it would differ when its static versus a
> > loadable
> > module though!
> >
> > With the 7.2.2 driver you also will use different mbuf pools depending on
> > the MTU you are using. If you use jumbo frames it will use 4K clusters,
> > if you go to 9K jumbos it will use 9K mbuf clusters. The number of these
> > allocated by default is small (like 6400 small :).
> >
> > I would use 'netstat -m' to see what the pools look like. Now that I
> think
> > about it, the reason it might fail as loaded while not as built in is you
> > get
> > allocation of the mbufs first when static, and something else is taking
> them
> > before you can load when loadable??
>
> Sorry to be quite late on this,
>
> Here is what gives me netstat -m with my new 9-CURRENT kernel but with
> old (working, after some time of computer use) if_em.ko :
> 1027/3458/4485 mbufs in use (current/cache/total)
> 1024/2066/3090/25600 mbuf clusters in use (current/cache/total/max)
> 1024/1792 mbuf+clusters out of packet secondary zone in use (current/cache)
> 0/367/367/12800 4k (page size) jumbo clusters in use
> (current/cache/total/max)
> 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max)
> 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max)
> 2304K/6464K/8769K 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)
> 0/0/0 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
>
> And here is the output with the new (non-working) if_em.ko :
> 1029/3456/4485 mbufs in use (current/cache/total)
> 1023/2067/3090/25600 mbuf clusters in use (current/cache/total/max)
> 1023/1793 mbuf+clusters out of packet secondary zone in use (current/cache)
> 0/367/367/12800 4k (page size) jumbo clusters in use
> (current/cache/total/max)
> 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max)
> 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max)
> 2303K/6466K/8769K 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)
> 0/0/0 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
>
> I've got the "em0: Could not setup receive structures" messages with
> the new if_em.ko even in single user mode. No network connectivity. I
> tried removing all other network-related modules (vboxnet, ipfw...)
> and still have this problem (again, even when booting in single-user
> mode).
> My network card is "em0_at_pci0:0:25:0:        class=0x020000
> card=0x304b103c chip=0x10ef8086 rev=0x05 hdr=0x00". I'm using a
> stripped-down GENERIC amd64 kernel (no network, no scsi, no raid...),
> a nearly empty sysctl.conf and loader.conf (except module loading).
>
> I saw at the time of the commit that an MFC to 8-STABLE was planned,
> but I don't think it should happen so soon. Given that my network
> adapter was previously working well before the em driver update, can't
> this be considerd a serious regression ?
>
> Thanks,
> Olivier
>
> --
> Olivier Smedts                                                 _
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