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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/