damir bikmuhametov wrote:
On Thu, Mar 30, 2006 at 10:13:57AM -0500, Stephen Clark wrote:
Do you know if the queue_maxlen is exceeded do the mbufs get lost? It
sort of seems that is what happens.
I'm sorry I'm unfamiliar with FreeBSD internals. I just noticed that
when I'm using gre tunnels (say, for WCCP or with DVB recievers) at some
time (various) net.inet.ip.intr_queue_drops starts increasing very fast
and I'm losing network connectivity. I've played with queue_maxlen and
found that increased value helps against that issues.
It seems that only gre suffers from the default (relatively small) queue
length.
FreeBSD splnet() equates directly to NetBSD's splsoftnet();
FreeBSD uses splimp() where (for networking) NetBSD would use splnet().
When you mentioned this only seems to happen on gre I looked at the
ip_gre.c which
comes from NetBSD, it uses splnet() where all the other FreeBSD stuff
used splimp().
So I changed gre.c to use splnet() and now I am not getting any drops,
even with queue_maxlen=50;
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