netdev - Re: cat /proc/net/tcp takes 0.5 seconds on x86

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Message-Id: <E1KYCV5-0002jW-00@gondolin.me.apana.org.au>
Date:	Wed, 27 Aug 2008 14:19:19 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	j.w.r.degoede@....nl (Hans de Goede)
Cc:	dada1@...mosbay.com, davej@...hat.com, netdev@...r.kernel.org
Subject: Re: cat /proc/net/tcp takes 0.5 seconds on x86_64

Hans de Goede <j.w.r.degoede@....nl> wrote:
> Eric Dumazet wrote:
>
>> # dmesg | grep "TCP established hash"
>> TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
>> # time cat /proc/net/tcp >/dev/null
>> 
>> real    0m0.091s
>> user    0m0.001s
>> sys     0m0.090s
> 
> As quoted above my idle x86_64, using the exact same hash table size, running 
> 2.6.27-rc2.git1 uses 0.520 seconds for that same command, thats a difference of 
> more then a factor 50 !!

That looks like a factor of 5 to me, not 50.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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