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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20060918220331.GB32520@tentacle.sectorb.msk.ru>
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. 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/