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iproute2 / tbf with large burst seems broken again

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From: Denys Fedoryschenko
Subject: iproute2 / tbf with large burst seems broken again
Date: Monday, August 24, 2009 - 5:07 am

Seems something related to the changes with resolution. I remember something 
like this happened before, and i report about it, but i am not able to find 
in mail archives. It seems packets queueing and not passing shaper, if burst 
is set to large value.

Kernel 2.6.30.4 was ok.

uname -a
Linux PPPoE_146 2.6.31-rc7-build-0046-32bit #6 SMP Sun Aug 23 03:51:14 EEST 
2009 i686 GNU/Linux

PPPoE_146 ~ # tc -s -d qdisc show dev ppp87;sleep 10;tc -s -d qdisc show dev 
ppp87
qdisc prio 1: root bands 3 priomap  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 Sent 47980 bytes 367 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 357p requeues 0
qdisc tbf 2: parent 1:1 rate 96000bit burst 2000Kb/8 mpu 0b lat 500.0ms
 Sent 47580 bytes 357 pkt (dropped 0, overlimits 376 requeues 0)
 rate 384bit 1pps backlog 0b 357p requeues 0
qdisc tbf 3: parent 1:2 rate 1024Kbit burst 2000Kb/8 mpu 0b lat 500.0ms
 Sent 400 bytes 10 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
qdisc ingress ffff: parent ffff:fff1 ----------------
 Sent 21342 bytes 347 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
qdisc prio 1: root bands 3 priomap  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 Sent 48410 bytes 372 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 362p requeues 0
qdisc tbf 2: parent 1:1 rate 96000bit burst 2000Kb/8 mpu 0b lat 500.0ms
 Sent 48010 bytes 362 pkt (dropped 0, overlimits 381 requeues 0)
 rate 448bit 1pps backlog 0b 362p requeues 0
qdisc tbf 3: parent 1:2 rate 1024Kbit burst 2000Kb/8 mpu 0b lat 500.0ms
 Sent 400 bytes 10 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
qdisc ingress ffff: parent ffff:fff1 ----------------
 Sent 21692 bytes 352 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0

PPPoE_146 ~ # cat /proc/net/psched
000003e8 00000040 000f4240 3b9aca00
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iproute2 / tbf with large burst seems broken again, Denys Fedoryschenko, (Mon Aug 24, 5:07 am)