From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Dave Taht <dave.taht@gmail.com>
Cc: Jonathan Morton <chromatix99@gmail.com>,
bloat-devel <bloat-devel@lists.bufferbloat.net>,
cerowrt-devel@lists.bufferbloat.net
Subject: Re: [Cerowrt-devel] optimizing for very small bandwidths with fq_codel better?
Date: Fri, 3 May 2013 07:01:48 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.00.1305030655000.24367@uplift.swm.pp.se> (raw)
In-Reply-To: <CAA93jw4D214HZXgY-MbGR9p_Q9Yj_Wyb57CaakPVrgem__kzdw@mail.gmail.com>
On Thu, 2 May 2013, Dave Taht wrote:
> 1) I think there's a bug in either the kernel or tc or me on tos matching,
Taking a guess here...
The TOS byte is 8 bytes. So EF is 46, which is 0x2e, and then you need to
left-shift it 2 bits because it's the most significant 6 bits, you get
0xb8 (if my early morning pre-breakfast hex calculations are correct). Try
matching on that and see if it works.
Some programs use the whole TOS byte, some just do the 6 DSCP bits. I
usually end up using tcpdump to see on the wire what the program actually
does.
--
Mikael Abrahamsson email: swmike@swm.pp.se
next prev parent reply other threads:[~2013-05-03 5:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-02 22:07 Dave Taht
2013-05-03 5:01 ` Mikael Abrahamsson [this message]
2013-05-03 11:45 ` Dave Taht
2013-05-03 5:58 ` Jonathan Morton
2013-05-03 16:53 ` Juliusz Chroboczek
2013-05-03 22:15 ` Dave Taht
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