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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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