netdev - Re: [PATCH v3 1/6] net: pad skb data and shinfo as a whole rather than individually

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: <1328020528.26983.396.camel@zakaz.uk.xensource.com>
Date:	Tue, 31 Jan 2012 14:35:27 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 1/6] net: pad skb data and shinfo as a whole rather
 than individually

Hi Eric,

On Wed, 2012-01-25 at 13:12 +0000, Eric Dumazet wrote:
> Le mercredi 25 janvier 2012 à 13:09 +0000, Ian Campbell a écrit :
> 
> > Can you elaborate on the specific benchmark you used there?
> 
> One machine was sending udp frames on my target (using pktgen)
> 
> Target was running a mono threaded udp receiver (one socket)

I've been playing with pktgen and I'm seeing more like 81,600-81,800 pps
from a UDP transmitter, measuring on the rx side using "bwm-ng -u
packets" and sinking the traffic with "nc -l -u -p 9 > /dev/null". The
numbers are the same with or without this series.

You mentioned numbers in the 820pps region -- is that really kilo-pps
(in which case I'm an order of magnitude down) or actually 820pps (in
which case I'm somehow a couple of orders of magnitude up).

I'm using a single NIC transmitter, no delay, 1000000 clones of each skb
and I've tried 60 and 1500 byte packets. In the 60 byte case I see more
like 50k pps

I'm in the process of setting up a receiver with a bnx2 but in the
meantime I feel like I'm making some obvious or fundamental flaw in my
method...

Any tips greatly appreciated.

Thanks,
Ian.

--
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