Re: [LARTC] tc limit

["Martin Schiøtz" <malinux@gmail.com>]

Thanks, with "prio #" on all filters - all rules can be added. 
:-)

Just curious - Is there a reason for the ~2K limit on filters with "prio 0"?

Martin

On Wed, 19 Jan 2005 07:12:56 -0800, gypsy <gypsy@iswest.com> wrote:
> 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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