netdev - Re: [PATCH 0/2] HTB scheduler HTB

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Date:	Mon, 16 Jun 2008 16:40:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	devik@....cz
Cc:	jdb@...x.dk, netdev@...r.kernel.org, kaber@...sh.net
Subject: Re: [PATCH 0/2] HTB scheduler HTB_HYSTERESIS modifications

From: Martin Devera <devik@....cz>
Date: Sat, 14 Jun 2008 11:18:00 +0200

> > I have now tested/deployed the patches on two production servers.
> > 
> >  Conclusion is: It should be safe to apply these patches.
> > 
> > See full report here:
> > http://people.netfilter.org/hawk/patches/htb_nohyst/production_test_results.html
> > 
> > We saw an increased number of interrupts on the test system, when
> > enabling/disabling htb_hysteresis.
> > 
> >  This didn't show up on the production system.
> > 
> > I believe that the increased intr (on test system) is an artifact of the
> > TCP download got less bursty and more smooth.
> 
> Which reminds me again, maybe after some time with hysteresis=off we 
> could remove it altogether...
> 
> Sorry for the delay, I got some flu or what. On my smaller dualcore 
> system there is also no noticeable (performance) impact.
> 
> I ACK Jesper's patches, thanks for the work and real-world testing!

I've applied Jesper's work to net-2.6, as it is primarily a bug
fix of sorts and safe because a backwards compatible knob is
provided just in case it does cause problems for people.

Thanks everyone!
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