Luigi Rizzo wrote:
On Mon, Oct 05, 2009 at 05:12:11PM +0500, rihad wrote:
Luigi Rizzo wrote:
On Mon, Oct 05, 2009 at 04:29:02PM +0500, rihad wrote:
Luigi Rizzo wrote:
...
you keep omitting the important info i.e. whether individual
pipes have drops, significant queue lenghts and so on.
Sorry. Almost everyone has 0 in the last Drp column, but some have above
zero. I'm not just sure how this can be helpful to anyone.
because you were complaining about 'dummynet causing drops and
waste of bandwidth'.
Now, drops could be due to either
1) some saturation in the dummynet machine (memory shortage, cpu
shortage, etc.) which cause unwanted drops;
I too think the box is hitting some other global limit and dropping
packets. If not, then how come that between 4a.m. and 10a.m. when the
traffic load is at 250-330 mbit/s there isn't a single drop?
there may be different reasons, e.g. the big offenders were
idle when you saw no drops. You still do not have enough
information on which packets are dropped and where,
so you cannot prove your assumptions.
Also, below:
1. increasing the queue size won't help at all. Those
who overflow a queue of 1000 slots will also overflow
a queue of 10k slots.
2. your test with 'ipfw allow ip from any to any' does not
prove that the interface queue is not saturating, because
you also remove the burstiness that dummynet introduces,
and so the queue is driven differently.
There's one thing I noticed:
net.inet.ip.dummynet.io_pkt_drop doesn't grow! But still around 400
packets dropped per second.
net.inet.ip.dummynet.tick_lost is always zero
net.inet.ip.dummynet.tick_diff: grows at about 50 per second.
net.inet.ip.dummynet.tick_adjustment: grows at about 5 per second.
How do I investigate and fix this burstiness issue?
$ netstat -i
Name Mtu Network Address Ipkts Ierrs Opkts
Oerrs Coll
bce0 1500 <Link#1> 00:1d:09:xx:xx:xx 24777049059 0 75426020
0 0
bce0 1500 xx.xx.xx.xx/xx my.hostname 159293969 - 75282225
- -
bce1 1500 <Link#2> 00:1d:09:xx:xx:xx 724725 0 24514919344
0 0
bce1 1500 192.168.94.0 local.hostname 656243 - 83024869
- -
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