On Tue, May 19, 2009 at 11:55:43AM +0100, Antonio Almeida wrote:

Doesn't seem to make any diference seting HTB_HYSTERESIS to 0. Here're
the values using #define HTB_HYSTERESIS 0

OK, so it looks like some hidden bug yet.

Many thanks for now,
Jarek P.

800 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 9773257752 bytes 12277962 pkt (dropped 6292541, overlimits 0 requeues 0)
 rate 621796Kbit 97644pps backlog 0b 127p requeues 0
 lended: 12277835 borrowed: 0 giants: 0
 tokens: -7 ctokens: -7

850 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 18225005732 bytes 22409017 pkt (dropped 11937269, overlimits 0 requeues 0)
 rate 600890Kbit 88796pps backlog 0b 43p requeues 0
 lended: 22408974 borrowed: 0 giants: 0
 tokens: -2 ctokens: -2

900 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 29790867368 bytes 35400708 pkt (dropped 18399726, overlimits 0 requeues 0)
 rate 636361Kbit 88779pps backlog 0b 127p requeues 0
 lended: 35400581 borrowed: 0 giants: 0
 tokens: -2 ctokens: -2


  Antonio Almeida



On Mon, May 18, 2009 at 8:05 PM, Jarek Poplawski [off-list ref] wrote:

quoted

On Mon, May 18, 2009 at 07:56:12PM +0100, Antonio Almeida wrote:

quoted

Precise measurements:

800 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 46793626324 bytes 57771194 pkt (dropped 29920019, overlimits 0 requeues 0)
 rate 621714Kbit 97631pps backlog 0b 126p requeues 0
 lended: 57771068 borrowed: 0 giants: 0
 tokens: -8 ctokens: -8


850 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 63422144616 bytes 77714246 pkt (dropped 41012275, overlimits 0 requeues 0)
 rate 600699Kbit 88756pps backlog 0b 127p requeues 0
 lended: 77714119 borrowed: 0 giants: 0
 tokens: -11 ctokens: -11


900 bytes:
class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 76868403562 bytes 92835297 pkt (dropped 48565133, overlimits 0 requeues 0)
 rate 636195Kbit 88755pps backlog 0b 126p requeues 0
 lended: 92835171 borrowed: 0 giants: 0
 tokens: -7 ctokens: -7


If you need more values you're free to ask.

Since you're so kind... :-) There is a line in net/sched/sch_htb.c:

#define HTB_HYSTERESIS 1        /* whether to use mode hysteresis for speedup */

Could you change 1 to 0, and repeat these tests above after recompiling?

More thanks,
Jarek P.