netdev - 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: <20080827223828.GD26610@one.firstfloor.org>
Date:	Thu, 28 Aug 2008 00:38:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	andi@...stfloor.org, dada1@...mosbay.com, rick.jones2@...com,
	johnpol@....mipt.ru, denys@...p.net.lb, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: loaded router, excessive getnstimeofday in oprofile\

> This is a much different kind of delay compared to sleeping for seconds
> or longer on the socket lock while a GFP_KERNEL allocation is being
> satisfied by swapping tons of crap out to disk.

When this happens then new incoming packets will be lost anyways
because there will be no new packets fed back into the RX ring
because their allocation will either stall or fail too.
I don't think time stamps of dropped packets are very useful ;-)

-Andi

-- 
ak@...ux.intel.com
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html