Re: [LARTC] HTB MPU

[Jason Boxman <jasonb@edseek.com>]

On Monday 17 May 2004 18:36, Andy Furniss wrote:
<snip>
> Could be this then -
>
> You can make HTB more accurate by setting HTB_HYSTERESIS to 0 in
> net/sched/sch_htb.c.
>

I have been messing with producing graphs with SNMP, so I only just did this.  
I was hoping to get before and after graphs to verify any changes, but I 
finally just did it.

Lucky for me, my ADSL line died tonight, so when it came back up I was able to 
see my ping on a completely idle link.  Using HTB with HTB_HYSTERESIS  set to 
0 appears to have greatly reduced my ping time.  It still skips up more often 
than when the link is completely idle, but it appears to be (without any 
graphs to verify) a marked improvement.  (Now I see more 75ms and an 
occasional 145ms instead of the complete reverse.)

68/70/75 out of 20 ICMP packets when idle.
68.3/91.6/215.7 ms out of 323 ICMP packets at 85% utilization.

From the comments in sch_htb.c I take it I just traded speed for accuracy in 
some of HTB's calculations, which on such a slow link is probably not an 
issue?

<snip>
> Andy.

Thanks!

-- 

Jason Boxman
Perl Programmer / *NIX Systems Administrator
Shimberg Center for Affordable Housing | University of Florida
http://edseek.com/ - Linux and FOSS stuff

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