Julian Elischer wrote:
rihad wrote:
Luigi Rizzo wrote:
On Mon, Oct 05, 2009 at 03:52:39PM +0500, rihad wrote:
Eugene Grosbein wrote:
On Mon, Oct 05, 2009 at 02:28:58PM +0500, rihad wrote:
Still not sure why increasing queue size as high as I want doesn't
completely eliminate drops.
The goal is to make sources of traffic to slow down, this is the only
way to descrease drops - any finite queue may be overhelmed with
traffic.
Taildrop does not really help with this. GRED does much better.
Alright, so I changed to gred by adding to each config command:
ipfw ... gred 0.002/900/1000/0.1 queue 1000
and reconfigured. Still around 300-400 drops per second, which was
typical at this load level before with taildrop anyway. There are
around 3-5 mbit/s being wasted according to systat -ifstat.
Should I now increase slots to 5-10-20k?
Very strange.
"ipfw pipe show" correctly shows that gred is at work. For example:
00512: 512.000 Kbit/s 0 ms 1000 sl. 79 queues (64 buckets)
GRED w_q 0.001999 min_th 900 max_th 1000 max_p 0.099991
mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000
...
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.
This tells us there are just a few sessions with VERY LARGE WINDOWS
that are trying to push the link too fast. They are flooding the
firewall and geting all the drops. (unless the problem is that the
hash/mask is putting a lot of session on the same slot.)
All masks are dst-ip 0xffffffff. I doubt very strongly that it's due to
such offenders, because all the way from 4a.m. to 10a.m. at the load of
200-330 mbit/s there are zero drops. There are no doubt heavy
downloaders leaving their PCs on in the night. The drops begin as soon
as the load crosses 340-360 mbit/s or some such, and it only worsens as
the load approaches 500-530 mbit/s.
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