Bug 80709 - HTB packet scheduler works incorectly with HZ other than 100 or 1024
HTB packet scheduler works incorectly with HZ other than 100 or 1024
Status: CLOSED ERRATA
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.3
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
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Depends On:
Blocks:
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Reported: 2002-12-30 02:48 EST by Mindaugas Riauba
Modified: 2007-04-18 12:49 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-06-07 15:40:02 EDT
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Description Mindaugas Riauba 2002-12-30 02:48:58 EST
Description of problem:
HTB packet scheduler works not correctly when HZ is other than 100
or 1024. RedHat's default is 512. And problem appears only with
UDP traffic. TCP is shaped OK.

Version-Release number of selected component (if applicable):
kernel-smp-2.4.18-18.7.x

How reproducible:
100%

Steps to Reproduce:
1. Setup traffic shaping with HTB class.
2. Flood link with UDP traffic.
    
Actual results:
Traffic exceeds set limit or even is not shaped at all.

Expected results:
Shaped traffic.

Additional info:
At least in include/net/pkt_sched.h there is the following code:

#if HZ == 100
#define PSCHED_JSCALE 13
#elif HZ == 1024
#define PSCHED_JSCALE 10
#else
#define PSCHED_JSCALE 0
#endif
Comment 1 Arjan van de Ven 2003-06-07 15:40:02 EDT
ought to be fixed in current erratum

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