On Tuesday 27 May 2003 14:09, Balazs Miklos wrote:> Hi,
>
> I have a Redhat Linux 7.2 box with stock 2.4.7 kernel and I''m
trying to
> do some bandwidth management with tc..
> I have created a CBQ class-hierarchy, and I have a class which is
> limited to 16Kbit and it can grow up to 32Kbits if there is available
> free bandwidth in the other classes. This class hasn''t got any
qdiscs
> attached to it, so (as I understood) it should have the pfifo_fast qdisc
> by default. But I have made a little test: I''ve mangled the TOS
field of
> the router''s outgoing ICMP packets to be 0x10 (minimize delay),
and I
> checked with tcpdump that they are actually getting mangled.
>
> The problem is, that it doesn''t seem to make any difference... the
ping
> is fine if the class is empty, but if I''m doing a download and
pinging
> the router at the same time, I experience delays in ping replies in both
> cases (either if the ICMP headers are mangled or not). Shouldn''t
the TOS
> mangled ping replies arrive with no delays at all, while the class is
> full with bulk traffic?
Why not doing the test after you add a pfifo_qdisc to that class? Just to see
if it makes any difference.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.oftc.net
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