From: Julien Vehent <julien@linuxwall•info>
To: Netdev <netdev@vger•kernel.org>
Cc: Roel van Meer <rolek@bokxing•nl>, <ahu@ds9a•nl>
Subject: Re: TBF parameters: overhead and linklayer ?
Date: Tue, 16 Mar 2010 11:21:34 +0100 [thread overview]
Message-ID: <398abc5c97bf8b552252ad85cda742cf@localhost> (raw)
In-Reply-To: <4b0881d1e12a25816f9efac65c4c54ec@localhost>
Gotcha !
in iproute2-2.6.33/tc/tc_util.c
442 int get_linklayer(unsigned int *val, const char *arg)
443 {
444 int res;
445
446 if (matches(arg, "ethernet") == 0)
447 res = LINKLAYER_ETHERNET;
448 else if (matches(arg, "atm") == 0)
449 res = LINKLAYER_ATM;
450 else if (matches(arg, "adsl") == 0)
451 res = LINKLAYER_ATM;
452 else
453 return -1; /* Indicate error */
454
455 *val = res;
456 return 0;
457 }
Now, if I try this, it works:
ses0gnoc:~# tc qdisc add dev eth0 root tbf rate 1mbit burst 10000 latency
10ms linklayer atm
ses0gnoc:~# tc -s qdisc show dev eth0
qdisc tbf 8004: root rate 1000Kbit burst 10000b lat 10.0ms
Sent 754 bytes 5 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
No ongoing taskforce to rewrite those manpages ? TC is a great tool, but
documentation severely suck...
On Tue, 16 Mar 2010 11:03:28 +0100, Julien Vehent <julien@linuxwall•info>
wrote:
> Thanks Roel,
>
> I then found this wwebsite from your link http://www.adsl-optimizer.dk
>
> I'm trying to find more information on how to use this... documentation
is
> really not easily accessible.
>
> (currently reading latest iproute2 source code available)
>
> On Tue, 16 Mar 2010 10:06:49 +0100, Roel van Meer <rolek@bokxing•nl>
> wrote:
>> Julien Vehent writes:
>>
>>> TC_TBF man page seem outdated (even in latest version of iproute2) and
>>> doesn't explain what those two parameters do:
>>>
>>> # tc qdisc add tbf help
>>> Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu
>>> BYTES[/BYTES] ]
>>> [ peakrate KBPS ] [ latency TIME ] [ overhead BYTES ] [
> linklayer
>>> TYPE ]
>>>
>>>
>>> - overhead ?
>>> - linklayer ?
>>>
>>> Or did I miss something ?
>>
>> No, you're right. You might want to have a look at this page:
>> http://ace-host.stuart.id.au/russell/files/tc/tc-atm/
>>
>> Regards,
>>
>> roel
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prev parent reply other threads:[~2010-03-16 10:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 16:42 TBF parameters: overhead and linklayer ? Julien Vehent
[not found] ` <cone.1268730409.349704.27722.1001@bork.lsof.org>
2010-03-16 10:03 ` TBF parameters: overhead and linklayer [UTF-8]? Julien Vehent
2010-03-16 10:21 ` Julien Vehent [this message]
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