[LARTC] Hmmm... Weird results with HTB in kernel 2.6.11

From: Justin Schoeman <justin@expertron.co.za>
To: lartc@vger.kernel.org
Subject: [LARTC] Hmmm... Weird results with HTB in kernel 2.6.11
Date: Mon, 26 Sep 2005 16:23:23 +0000	[thread overview]
Message-ID: <4338207B.4050806@expertron.co.za> (raw)

Hi all,

I have been getting some strange results with HTB in kernel 2.6.11, and 
was wondering if anybody could give me some advice.  Also, if someone 
could direct me to the changelog for the recent versions so I can see if 
it is worth upgrading?

Anyway, the problem can best be summed up by looking at the output of 
'tc -s -d class show dev eth0'. Some of the relevant results are:

class htb 1:1 root rate 1686Kbit ceil 1686Kbit burst 1809b/8 mpu 0b 
overhead 0b
cburst 1809b/8 mpu 0b overhead 0b level 7
  Sent 1964319339 bytes 2514673 pkt (dropped 0, overlimits 0 requeues 0)
  rate 1694Kbit 244pps backlog 0b 0p requeues 0
  lended: 1257439 borrowed: 0 giants: 0
  tokens: -29826 ctokens: -29826

class htb 1:8 parent 1:1 rate 32000bit ceil 1686Kbit burst 1603b/8 mpu 
0b overhe
ad 0b cburst 1809b/8 mpu 0b overhead 0b level 6
  Sent 27361971 bytes 52043 pkt (dropped 0, overlimits 0 requeues 0)
  rate 32704bit 6pps backlog 0b 0p requeues 0
  lended: 16076 borrowed: 2007 giants: 0
  tokens: -1796566 ctokens: 16310

class htb 1:39 parent 1:1 rate 8000bit ceil 1686Kbit burst 1600b/8 mpu 
0b overhe
ad 0b cburst 1809b/8 mpu 0b overhead 0b level 6
  Sent 258423850 bytes 281091 pkt (dropped 0, overlimits 0 requeues 0)
  rate 132152bit 19pps backlog 0b 0p requeues 0
  lended: 5241 borrowed: 270604 giants: 0
  tokens: -1073545 ctokens: 1525

As you can see, the parent class is pretty much maxxed out, which is 
fine, but two of the child classes are not OK... 1:8 with a target rate 
of 32kbit is getting 32kbit, while 1:39 with a target rate of 8kbit is 
getting 132kbit!  Looking at the states, this seems to be the normal 
state while the link is saturated.

Can anybody see something obvious wrong (perhaps an underflow, or 
something?), or is more info needed? If so, what info?

Thanks!

Justin
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