netdev - Re: HTB accuracy for high speed

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Date:	Mon, 18 May 2009 13:05:32 +0100
From:	Antonio Almeida <vexwek@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org, kaber@...sh.net, davem@...emloft.net,
	devik@....cz
Subject: Re: HTB accuracy for high speed

The analyser traffic is tcp. Setting tso off the accuracy stays the same

# ethtool -K eth0 tso off
# ethtool -K eth1 tso off

# ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off

# ethtool -k eth1
Offload parameters for eth1:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off


# tc -s -d class ls dev eth1 | head -24
class htb 1:10 parent 1:2 rate 900000Kbit ceil 900000Kbit burst
113962b/8 mpu 0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level
5
 Sent 164938012460 bytes 206824215 pkt (dropped 0, overlimits 0 requeues 0)
 rate 652715Kbit 97655pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 402 ctokens: 402

class htb 1:1 root rate 900000Kbit ceil 900000Kbit burst 113962b/8 mpu
0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level 7
 Sent 164938012460 bytes 206824215 pkt (dropped 0, overlimits 0 requeues 0)
 rate 652715Kbit 97655pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 402 ctokens: 402

class htb 1:2 parent 1:1 rate 900000Kbit ceil 900000Kbit burst
113962b/8 mpu 0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level
6
 Sent 164938012460 bytes 206824215 pkt (dropped 0, overlimits 0 requeues 0)
 rate 652715Kbit 97655pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 402 ctokens: 402

class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 164938040048 bytes 206824248 pkt (dropped 25827911, overlimits 0
requeues 0)
 rate 652715Kbit 97655pps backlog 0b 33p requeues 0
 lended: 206824215 borrowed: 0 giants: 0
 tokens: -6 ctokens: -6


I'm applying the patches now. I'll get back to you.

  Antonio Almeida



On Mon, May 18, 2009 at 12:14 PM, Jarek Poplawski <jarkao2@...il.com> wrote:
> On Mon, May 18, 2009 at 11:39:02AM +0100, Antonio Almeida wrote:
>> Hi!
>>
>> Here the information you asked:
>
> Very nice, but there are some questions:
> - if this analyser uses tcp we definitely need tso off as well during
>  these tests,
> - it would be nice to use two patches I've sent to exclude known (now)
>  reasons.
>
> With the above I expect accuracy should be better, but definitely not
> like hfsc (plus no higher than 1000Mbit rate reported after stopping
> effect).
>
> Thanks,
> Jarek P.
>
>>
>> # ethtool -k eth0
>> Offload parameters for eth0:
>> rx-checksumming: on
>> tx-checksumming: on
>> scatter-gather: on
>> tcp segmentation offload: on
>> udp fragmentation offload: off
>> generic segmentation offload: off
>>
>> # ethtool -k eth1
>> Offload parameters for eth1:
>> rx-checksumming: on
>> tx-checksumming: on
>> scatter-gather: on
>> tcp segmentation offload: on
>> udp fragmentation offload: off
>> generic segmentation offload: off
>>
>> The bridge is between eth0 and eth1
> ...
>
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