dummynet dropping too many packets
eugen at kuzbass.ru
Mon Oct 5 13:56:36 UTC 2009
On Mon, Oct 05, 2009 at 05:18:29PM +0500, rihad wrote:
> >You've mentioned previously: "The pipes are fine, each normally having
> >100-120 concurrent consumers (i.e. active users)."
> >This IS competition between TCP flows inside each pipe.
> Well, each user gets instantiated with a new copy of the pipe. Each such
> user counts towards the limit imposed by hash_size*max_chain_len for
> that pipe only. It would have been competition had I used dst-ip dst-ip
> 0xffffff00 or similar and not dst-ip 0xffffffff, _then_ all 256 users
> (determined by the mask) would compete for the pipe's bandwidth. So the
> only competition is in the uplink at our main Cisco, I guess.
Hmm, yes, you are rigth. I've missed 'mask'.
Try to disable net.inet.ip.dummynet.io_fast to see if there is a bug
in 'fast' dummynet mode.
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