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: <Pine.LNX.4.64.0906122248450.31625@melkinkari.cs.Helsinki.FI>
Date:	Fri, 12 Jun 2009 22:57:41 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Benjamin LaHaise <ben.lahaise@...erion.com>,
	David Miller <davem@...emloft.net>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: lots of cpu time spent in skb_copy_bits() in net-next with small
 mtu

On Fri, 12 Jun 2009, Benjamin LaHaise wrote:

> Just a heads up: something in net-next is resulting in lots of cpu time 
> being spent in skb_copy_bits() (called from tcp_collapse()) when an ethernet 
> interface mtu is lowered to 576 on the source and dest machines running 
> netperf.  This behaviour does not appear in 2.6.29.  I'll try to bisect 
> it this weekend.

I'd suggest somebody goes through DaveM's abstraction patch 915219441d56 
(I'm totally out of time so somebody else has to do it if a timely 
solution is desired)... It was quite messy on those parts and I already 
found one issue from it (2df9001edc3) and wouldn't be too surprised if 
there would be some more lurking around... 


-- 
 i.
--
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

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ