John Smith wrote:
Hello *!
My trafficshaping (tc-htb) drops packets very early, at least i suspect
this. It drops about 30% fo the packets. The traffic-generating appication
is running locally on the shaping host. I think i can lower this rate by
increasing the packet-buffer, because the locally application will slow down
with increasing buffer (tcp/ip). But i can´t find any options for that, i
cycled the manual several times. Is there a solution?
see output of "tc -s -d class show dev ppp0" (main class):
class htb 1:10 parent 1:1 prio 1 quantum 1800 rate 144000bit
ceil 480000bit burst 1779b/8 mpu 0b overhead 0b cburst 2199b/8
mpu 0b overhead 0b level 0
Sent 57567157 bytes 40609 pkts (dropped 16033, overlimits 0)
rate 460328bit 40pps
lended: 12845 borrowed: 27764 giants: 0
tokens: -74623 ctokens: -28826
This class is the only one with packet drops. Does tc use the kernels
network packet queue?
HTB uses the txqueuelength of the interface if you don't add a queue to
the leaf class. For my ppp0 that's 3 which is a bit short - even so I
just did a test and only got 10% loss so maybe your generator app/kernel
version of tcp is a bit over aggressive. I did 1 tcp stream with netperf
on 2.6.12-rc1.
So either add a queue to the leaf and specify a length or before you
start htb do ifconfig ppp0 txqueuelen 30 or whatever.
Andy.
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