linux-kernel - Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

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Date:	Tue, 19 Sep 2006 02:03:31 +0400
From:	"Vladimir B. Savkin" <master@...torb.msk.ru>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc:	Andi Kleen <ak@...e.de>, Jesper Dangaard Brouer <hawk@...u.dk>,
	Harry Edmon <harry@...os.washington.edu>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

On Tue, Sep 19, 2006 at 02:00:38AM +0400, Alexey Kuznetsov wrote:
> Hello!
> 
> > Please think about it this way:
> > suppose you haave a heavily loaded router and some network problem is to
> > be diagnosed. You run tcpdump and suddenly router becomes overloaded (by
> > switching to timestamp-it-all mode
> 
> I am sorry. I cannot think that way. :-)
> 
> Instead of attempts to scare, better resend original report,
> where you said how much performance degraded, I cannot find it.
> 
> * I do see get_offset_pmtmr() in top lines of profile. That's scary enough.

I had it at the very top line.

> * I do not undestand what the hell dhcp needs timestamps for.
> * I do not listen any suggestions to screw up tcpdump with a sysctl.
>   Kernel already implements much better thing then a sysctl.
>   Do not want timestamps? Fix tcpdump, add an options, submit the
>   patch to tcpdump maintainers. Not a big deal. 

OK, point taken.
It's better to patch tcpdump.

> 
> Alexey
> 
~
:wq
                                        With best regards, 
                                           Vladimir Savkin. 

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