linux-kernel - Re: bad networking related lag in v2.6.22-rc2

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Date:	Mon, 21 May 2007 23:30:31 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Anant Nitya <kernel@...chanda.info>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: bad networking related lag in v2.6.22-rc2

Patrick McHardy wrote:
> Ingo Molnar wrote:
> 
>>* Anant Nitya <kernel@...chanda.info> wrote:
>>
>>>I am posting links to the information you asked for. One more thing, 
>>>after digging a bit more I found its QoS shaping that is making the 
>>>box crawl. Once I disabled the traffic shaping everything comes back 
>>>to smooth and normal. Shaping being done on very low speed residential 
>>>ADSL 256/64 Kbps connection. If you want me to post shaping rules, 
>>>please free to ask. BTW its a simple HTB/SFQ rules.
>>
>>[...]
>>
>>
>>>http://cybertek.info/taitai/trace-to-ingo.txt.bz2
>>
>>
>>thanks! This trace indeed includes the smoking gun, htb_dequeue() and 
>>__qdisc_run():
>>
>>[..]
> 
> This looks like fallout from the switch to hrtimers. Anant, please
> send me your HTB script, I'll try to reproduce it.


I think I already found the bug, please try if this patch helps.


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