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=1000
# 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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