netdev - Re: TBF parameters: overhead and linklayer ?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <398abc5c97bf8b552252ad85cda742cf@localhost>
Date:	Tue, 16 Mar 2010 11:21:34 +0100
From:	Julien Vehent <julien@...uxwall.info>
To:	Netdev <netdev@...r.kernel.org>
Cc:	Roel van Meer <rolek@...xing.nl>, <ahu@...a.nl>
Subject: Re: TBF parameters: overhead and linklayer  ?

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@...uxwall.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@...xing.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 TC_TBF man page seem outdated (even in latest version of iproute2) and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
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html