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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Sat, 14 Jan 2012 17:06:46 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>
Subject: Re: [RFC] netem:  de-GSO packets before enqueing

* Stephen Hemminger | 2012-01-12 16:57:20 [-0800]:

>Probably something like this is needed (untested).
>
>This issue was discovered when looking at the skb_checksum path for the
>netem corruption operation, but it is a general problem.
>Network emulation operations like corruption and drop want to operate
>on a per-packet (not per-segment) basis. This patch does GSO in software
>if necessary to break up packets.  Code is similar to logic in xfrm_output.
>
>Although it appears that the operation is not work conserving, it is okay
>because the higher level qdisc operations account for packets by incrementing
>by gso_size.

Thanks Stephen! Corruption is currently unusable if GSO is enabled. We disable
GSO/TSO on all our test machines therefore.

I have a larger set of patches for the corruption option for this merge
window. We will now test your patch (and the hopefully following qdisc len
updated patch).

Hagen
--
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