Stas Oskin wrote:
Hi.
I'm using the following filter from lartc "ultimate PPP" example:
tc filter add dev $DEV parent ffff: protocol ip prio 50 u32 match ip src \
0.0.0.0/0 police rate ${DOWNLINK}kbit burst 10k drop flowid :1
It works fine, but when I remove the "burst 10k", I receive the following
error:
"burst" requires "rate".
Illegal "police"
AFAIK, burst is how many bytes can be transferred over "rate" up to "ceil"
and is an optional parameter, but here it is mandatory? Also, shouldn't the
"ceil" parameter absence make this parameter useless?
You are thinking of htb - for policer burst/buffer is required.
policers don't delay/shape/queue packets, they just drop overrate
packets (when used with the drop param).
The burst is the length of a virtual buffer used to decide when to drop
a packet, when it's "full" everything else gets dropped till enough time
has passed for it to have enough room for the next packet, how much time
depends on the rate.
It needs to be at least MTU (MTU+14 on eth) or the policer won't pass
full size packets at all. If you make it too small, like making a real
buffer too small - it won't be nice for tcp throughput.
Andy.
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