[LARTC] Clock Source Kernel settings in 2.6.22

From: "Mario Antonio Garcia" <dino@webjogger.net>
To: lartc@vger.kernel.org
Subject: [LARTC] Clock Source Kernel settings  in 2.6.22
Date: Wed, 29 Aug 2007 13:24:10 +0000	[thread overview]
Message-ID: <45E4FD623F464B30A0067FF269007B89@shadow> (raw)

I wonder if somebody has got good results (accurate shaping) using 2.6.22?

I am testing with 2.6.22.1, and I haven't been able to get accurate shaping.
For instance, I tried:
        $TC qdisc  add  dev  eth0 root handle 1: htb default 1
        $TC class  add  dev  eth0        parent 1:  classid  1:1        htb 
rate 100000kbit ceil 100000kbit burst 24k cburst 24k
        $TC class  add  dev  eth0        parent 1:1 classid 1:10        htb 
rate 20000kbit ceil 20000kbit burst 24k cburst 24k

and class 1:10 shapes the traffic to 19900kbit instead of 20000kbit 
(bandwidth tests made with ftp and iperf)

My corresponding kernel settings are:
CONFIG_GENERIC_TIME=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_HPET_TIMER=y
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
CONFIG_HZ_1000=y
CONFIG_HZ\x1000
# CONFIG_CPU_FREQ is not set
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_FIFO=y

Notice that in 1.26.22 there are new patches for Clock Source:
http://lists.openwall.net/netdev/2007/03/16/22
"These patches convert the packet schedulers to use ktime as only clock 
source and kill off the manual clock source selection. Additionally all 
packet schedulers are converted to use hrtimer-based Watchdogs, greatly 
increasing scheduling precision."

Regards,

Mario Antonio 

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