* Tony Sarendal <[EMAIL PROTECTED]> [2007-09-27 10:36]: > On 9/26/07, Tom Bombadil <[EMAIL PROTECTED]> wrote: > > > net.inet.ip.ifq.maxlen defines how many packets can be queued in the IP > > > input queue before further packets are dropped. Packets comming from the > > > network card are first put into this queue and the actuall IP packet > > > processing is done later. Gigabit cards with interrupt mitigation may > > spit > > > out many packets per interrupt plus heavy use of pf can slowdown the > > > packet forwarding. So it is possible that a heavy burst of packets is > > > overflowing this queue. On the other hand you do not want to use a too > > big > > > number because this has negative effects on the system (livelock etc). > > > 256 seems to be a better default then the 50 but additional tweaking may > > > allow you to process a few packets more. > > Thanks Claudio... > > In the link that Stuart posted here, Henning mentions 256 times the > > number of interfaces: > > http://archive.openbsd.nu/?ml=openbsd-tech&a=2006-10&t=2474666 > Is that per physical or per logical interface ?
it is a rule of thumb. an approximation. for typical cases. > [EMAIL PROTECTED] ifconfig -a | grep ^vlan | wc -l > 4094 that is not a typical case. you do not wanna set your ifqlen to 1048064 :) the highest qlen I have is somewhere around 2500. where the high watermark is... I cannot really say. I'd be careful going far higher than the above. -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam
