Message-ID: <4514147D.5040803@hp.com>
Date: Fri, 22 Sep 2006 09:51:09 -0700
From: Rick Jones <rick.jones2@hp.com>
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To: Andi Kleen <ak@suse.de>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
       David Miller <davem@davemloft.net>, master@sectorb.msk.ru, hawk@diku.dk,
       harry@atmos.washington.edu, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
Subject: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20
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> That came from named. It opens lots of sockets with SIOCGSTAMP.
> No idea what it needs that many for.

IIRC ISC BIND named opens a socket for each IP it finds on the system. 
Presumeably in this way it "knows" implicitly the destination IP without 
using platform-specific recvfrom/whatever extensions and gets some 
additional parallelism in the stack on SMP systems.

Why it needs/wants the timestamps I've no idea, I don't think it gets 
them that way on all platforms.  I suppose the next time I do some named 
benchmarking I can try to take a closer look in the source.

rick jones
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