On 8/28/07, Max Laier <[EMAIL PROTECTED]> wrote:
> > I'm going to toy with some settings for the em(4) driver in
> > loader.conf and see if I can raise the txd and rxd descriptors since
> > we're not running on 82542 or 82543 chipped hardware we can go above
> > 256 descriptors.
Raised it to 4096 for both txd and rxd with no impact (may help
something else, who knows).
> No that's the internal work deferral queue. Try something like the
> following in contrib/pf/net/if_pfsync.c:
>
> @@ -229,7 +229,7 @@
> callout_init(&sc->sc_bulk_tmo, NET_CALLOUT_MPSAFE);
> callout_init(&sc->sc_bulkfail_tmo, NET_CALLOUT_MPSAFE);
> callout_init(&sc->sc_send_tmo, NET_CALLOUT_MPSAFE);
> - sc->sc_ifq.ifq_maxlen = ifqmaxlen;
> + sc->sc_ifq.ifq_maxlen = 2 * ifqmaxlen;
> mtx_init(&sc->sc_ifq.ifq_mtx, ifp->if_xname, "pfsync send queue",
> MTX_DEF);
> if_attach(ifp);
>
> But there might be other reasons like timing wrt the locks. I'll have to
> check for details. It might also be a good idea to MFC the taskqueue
> approach from CURRENT, rather than using the callout ... that's a bit of
> work however.
That seems to have halved the error rate, not sure if it's not just
the time of day though (we're now past our peak traffic load by a few
hours).
$ netstat -s -ppfsync && sleep 1 && netstat -s -ppfsync
pfsync:
383169 packets received (IPv4)
0 packets received (IPv6)
0 packets discarded for bad interface
0 packets discarded for bad ttl
0 packets shorter than header
0 packets discarded for bad version
0 packets discarded for bad HMAC
0 packets discarded for bad action
0 packets discarded for short packet
0 states discarded for bad values
0 stale states
35622 failed state lookup/inserts
23635 packets sent (IPv4)
0 packets sent (IPv6)
0 send failed due to mbuf memory error
5580 send error
pfsync:
387782 packets received (IPv4)
0 packets received (IPv6)
0 packets discarded for bad interface
0 packets discarded for bad ttl
0 packets shorter than header
0 packets discarded for bad version
0 packets discarded for bad HMAC
0 packets discarded for bad action
0 packets discarded for short packet
0 states discarded for bad values
0 stale states
35711 failed state lookup/inserts
23876 packets sent (IPv4)
0 packets sent (IPv6)
0 send failed due to mbuf memory error
5676 send error
--Bill
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