Badalian Vyacheslav wrote:
Martin Devera пишет:
Patrick McHardy wrote:
Badalian Vyacheslav wrote:
Hello all.
I have many messages like "htb: too many events !" in dmesg.
Try to see code and find that function try do 500 events at call.
Hm... may anyone ask why 500? Why its not dynamic value based on
performance of PC?
Thats a good question, I wonder why it is limited at all.
Martin, any hints?
Hi, I recently replied someone to the same question:
> it is possible when during one jiffie (1 or 10ms) more than 500 classes
> changed its state. It is meant to protect your system from livelock.
> The constant should be set to something like
> bogomips/bogocomplexity_of_state_change but it was not done.
the solution I have in my mind is to change
if (net_ratelimit())
printk(KERN_WARNING "htb: too many events !\n");
return HZ/10;
to
return 1;
to drain extra events asap. It the time of writing I was not able to
come with better solution and there were more bugs related to this
part of code than now.
We want way to smooth big burst of events over more dequeue invocations
in order to not slow dequeue too much. Constant 500 is max. allowed
"slowdown" of dequeue.
Any bright idea how to do it more elegant, Patrick ?
brgds, devik
Hmm.. i simple see that if i get messages like this in dmesg my PC limit
speed, but i have many free CPU and HTB classes have not full bandwidth
load....
If i delete half rules - i get bandwidth that i wont. I wrong understand
that if we have this limit (constant 500) my PC can't get full performance?
Look scheme (example in my memory... not real numbers... for idea only):
HTB (default 1)
- Class 1 (rate 250mbs cell 500 prio 1)
---- Here 8000 HTB rules (parent 1) (rate 1kbs, cell from 200kbs to 5mbs)
- Class 2 (rate 250mbs cell 500 prio 1)
I always go to 2.
try ttcp.
current rate in class 1 - above 150mbs
current rate in class 2 - above 200mbs
Load avg above 0.10 - 0.25
Idle - 80%
Try delete half rules
current rate in class 1 - above 100mbs
current rate in class 2 - above 400mbs
Load avg above 0.10 - 0.25
Idle - 80%
All traffic in class 2 do i witch ttcp! its not deleted clients from
class 1.
Any idea? Thanks.
The change above (returning 1 instead of HZ/10) should help, it was tested. Also
you CAN increase the 500 to say 2000. I didn't the change as I'm not sure it is
good generic fix...
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