Eugene Grosbein wrote:
On Mon, Oct 05, 2009 at 03:20:58PM +0500, rihad wrote:
Taildrop does not really help with this. GRED does much better.
i think the first problem here is figure out _why_ we have
the drops, as the original poster said that queues are configured
with a very large amount of buffer (and i think there is a
misconfiguration somewhere because the mbuf stats do not make
sense)
That may be very simple, f.e. wide uplink channel and policy that
dictates slower client speeds. Any taildrop queue would drop lots
of packets.
If uplink is e.g. 100 mbit/s, but data is fed to client by dummynet at 1
mbit/s, doesn't the _client's_ TCP software know to slow things down to
not overwhelm 1 mbit/s?
That's not client's TCP software feeding your router with traffic
but server side.
Yup, I meant client-side decreasing congestion window, delaying ACKs
etc. etc., typical for TCP congestion control. Or...?
GRED didn't solve the problem :(
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