2043243 – [tc-htb] error when setting burst max value

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Bug 2043243 - [tc-htb] error when setting burst max value

Summary: [tc-htb] error when setting burst max value

Keywords:
Status:	CLOSED NEXTRELEASE
Alias:	None
Product:	Red Hat Enterprise Linux 8
Classification:	Red Hat
Component:	iproute
Sub Component:
Version:	8.4
Hardware:	All
OS:	Unspecified
Priority:	unspecified
Severity:	medium
Target Milestone:	rc
Target Release:	8.5
Assignee:	Andrea Claudi
QA Contact:	Mingyu Shi
Docs Contact:
URL:
Whiteboard:
Depends On:	1910745
Blocks:
TreeView+	depends on / blocked

Reported:	2022-01-20 21:27 UTC by David Hill
Modified:	2023-10-09 07:45 UTC (History)
CC List:	7 users (show)
Fixed In Version:	iproute-6.2.0-2.el8
Doc Type:	If docs needed, set a value
Doc Text:
Clone Of:	1910745
Environment:
Last Closed:	2023-10-09 07:45:33 UTC
Type:	Bug
Target Upstream Version:
Embargoed:
Dependent Products:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Issue Tracker	RHELPLAN-109031	0	None	None	None	2022-01-20 21:31:56 UTC

Comment 11 Mingyu Shi 2022-02-15 02:22:48 UTC

Hi Andrea

I ACKed the bug, when you'll have evaluated the DTM, please help me to set ITM = DTM + 2, thanks!

Comment 18 Mingyu Shi 2023-10-08 07:03:20 UTC

[root@vm-10-0-184-70 ~]# rpm -q iproute
iproute-6.2.0-5.el8_9.x86_64
[root@vm-10-0-184-70 ~]# ip link add type veth
[root@vm-10-0-184-70 ~]# ip link set veth0 up
[root@vm-10-0-184-70 ~]# ip link set veth1 up
[root@vm-10-0-184-70 ~]# tc class add dev veth0 parent 1: classid 1:1 htb rate 100KBps burst errtrigger
bash: tc: command not found
[root@vm-10-0-184-70 ~]# dnf install iproute-tc
Updating Subscription Management repositories.
Unable to read consumer identity

This system is not registered with an entitlement server. You can use subscription-manager to register.

Last metadata expiration check: 1:01:13 ago on Sun 08 Oct 2023 02:00:23 AM EDT.
Dependencies resolved.
==============================================================================================================================================================
 Package                                Architecture                       Version                                     Repository                        Size
==============================================================================================================================================================
Installing:
 iproute-tc                             x86_64                             6.2.0-5.el8_9                               rhel                             469 k

Transaction Summary
==============================================================================================================================================================
Install  1 Package

Total download size: 469 k
Installed size: 883 k
Is this ok [y/N]: y
Downloading Packages:
iproute-tc-6.2.0-5.el8_9.x86_64.rpm                                                                                            15 MB/s | 469 kB     00:00    
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                          15 MB/s | 469 kB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                                                      1/1 
  Installing       : iproute-tc-6.2.0-5.el8_9.x86_64                                                                                                      1/1 
  Running scriptlet: iproute-tc-6.2.0-5.el8_9.x86_64                                                                                                      1/1 
  Verifying        : iproute-tc-6.2.0-5.el8_9.x86_64                                                                                                      1/1 
Installed products updated.

Installed:
  iproute-tc-6.2.0-5.el8_9.x86_64                                                                                                                             

Complete!
[root@vm-10-0-184-70 ~]# tc class add dev veth0 parent 1: classid 1:1 htb rate 100KBps burst errtrigger
Illegal "burst"
Usage: ... qdisc add ... htb [default N] [r2q N]
                      [direct_qlen P] [offload]
 default  minor id of class to which unclassified packets are sent {0}
 r2q      DRR quantums are computed as rate in Bps/r2q {10}
 debug    string of 16 numbers each 0-3 {0}

 direct_qlen  Limit of the direct queue {in packets}
 offload  enable hardware offload
... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]
                      [prio P] [slot S] [pslot PS]
                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]
 rate     rate allocated to this class (class can still borrow)
 burst    max bytes burst which can be accumulated during idle period {computed}
 mpu      minimum packet size used in rate computations
 overhead per-packet size overhead used in rate computations
 linklay  adapting to a linklayer e.g. atm
 ceil     definite upper class rate (no borrows) {rate}
 cburst   burst but for ceil {computed}
 mtu      max packet size we create rate map for {1600}
 prio     priority of leaf; lower are served first {0}
 quantum  how much bytes to serve from leaf at once {use r2q}




As expected, it showed "Illegal burst"

Comment 19 Andrea Claudi 2023-10-09 07:45:33 UTC

Fixed in rhel-8.9.

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