linux-kernel - Re: loaded router, excessive getnstimeofday in oprofile

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Message-ID: <48B58586.3080806@hp.com>
Date:	Wed, 27 Aug 2008 09:49:10 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Eric Dumazet <dada1@...mosbay.com>,
	Denys Fedoryshchenko <denys@...p.net.lb>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: loaded router, excessive getnstimeofday in oprofile

Andi Kleen wrote:
>>Those banks really want to crank down on latency - to the point they 
>>start disabling interrupt coalescing.  I bet they'd toss anything out 
>>they could to shave another microsecond.
> 
> 
> This change would actually likely lower their latency.

I'm guessing you mean increase their latency?  I agree, it could - 
depends entirely on the PPS in production I suspect.

rick jones

ftp://ftp.cup.hp.com/dist/networking/briefs/nic_latency_vs_tput.txt

I should probably refresh/update that one of these days
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