dummynet dropping too many packets

[Oleg Bulyzhin]

On Wed, Oct 07, 2009 at 03:16:27PM +0500, rihad wrote:
> Oleg Bulyzhin wrote:
> > On Wed, Oct 07, 2009 at 02:23:47PM +0500, rihad wrote:
> > 
> > Few questions:
> > 1) why are you not using fastforwarding?
> > 2) search_steps/searches ratio is not that good, are you using 'buckets'
> >    keyword in your pipe configuration?
> > 3) you have net.inet.ip.fw.one_pass = 0, is it intended?
> > 
> 1) and 3): the box does traffic accounting and shaping, so I need 
> one_pass=0 to do both ngtee and pipes.
Still can not see any objection for not using fastforwarding, and usually
ipfw ruleset can be rearranged for using dummynet & netgraph with one_pass=1.
Could you show your 'ipfw show' output? (hide ip addresses if you wish but
keep counters please).

> 2) Hm, I'm not using "buckets", but rather 
> net.inet.ip.dummynet.hash_size. It's at default, 64. I've tried setting 
> net.inet.ip.dummynet.hash_size=65536 in sysctl.conf but somehow it was 
> still 64 after reboot, so I left it at 64. Should I make it 128? 256? 
> Does it matter that much? The load is at approx. 70-120 consumers per 
> pipe, so I thought 64 bucket size was enough.
It depends on traffic pattern, try to increase it and watch
search_steps/searches ratio (~1.001 is good enough)

-- 
Oleg.

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=== Oleg Bulyzhin -- OBUL-RIPN -- OBUL-RIPE -- oleg at rinet.ru ===
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