Re: [LARTC] tc limit

[gypsy <gypsy@iswest.com>]

Martin Schiøtz wrote:
> 
> Hi

Hello.
 
> I have been playing with tc. I'm using htb and sfq. I tried to setup
> shaping of every ip address  within a /20.
> I found that there must be an upper limit of about 2096 on the number
> of rules (classes, qdiscs or filters). I was testing a /20 which gives
> 4096 classes, qdiscs and filters. I'm using hashkey to optimize
> processing of frames.

Filters.
 
> Is there a limit with tc or I'm I doing something wrong ?

Yes, sort of.  Yes.

> This is the script:
> #!/bin/sh
> 

> /sbin/tc filter add dev eth1 parent 1:3 protocol ip u32

'prio #' must be included in all 'filter' lines where "#" is not zero
and is always the same; the "zero prio" has a limit and there is a limit
on '#' - but no limit on how many times '#' can be (e.g.) 5

So, e.g.:
tc filter add dev eth1 parent 1: protocol ip prio 5 \
   u32 match ip src $IP flowid 1:40

will run at least 64K times without complaint, but this will fail after
~2K:
tc filter add dev eth1 parent 1: protocol ip prio 0 \
   u32 match ip src $IP flowid 1:40

> /sbin/tc filter add dev eth1 parent 1:3 handle 3: protocol ip u32 divisor 256
> /sbin/tc filter add dev eth1 protocol ip parent 1: u32 match ip dst
> 10.0.0.0/20 hashkey mask 0x000000ff at 16 link 3:

google LARTC please document

gypsy
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