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
...
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