netdev - Re: loaded router, excessive getnstimeofday in oprofile

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Message-Id: <200808282255.29640.denys@visp.net.lb>
Date:	Thu, 28 Aug 2008 22:55:29 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Joe Malicki <jmalicki@...acarta.com>,
	David Miller <davem@...emloft.net>, johnpol@....mipt.ru,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	juhlenko@...mai.com, sammy@...my.net
Subject: Re: loaded router, excessive getnstimeofday in oprofile

On Thursday 28 August 2008, Eric Dumazet wrote:
> OK, please try oprofile with call graph analysis.
I did already. Even because most of programs (except ripd/zebra) can be 
killed, and i kill them, it doesn't change almost anything.

it seems heavy things causing instability:

1)HTB (resolution can be lowered to improve performance, i will try Jarek 
patch soon)
2)ocassionally ping/tcpdump other SO_TIMESTAMP users
3)Probably softlockup detection. Disabled already, i will come back to it 
soon, if it is required.

One of other issues i notice - "CACHE MISS" cause maybe almost 5-10% in 
oprofile in u32, but i am not sure it is interesting subject to discuss. I 
have to optimize all my iproute2 rules first.

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