netdev - Re: [PATCH net-next] pktgen: Add NOINIT option to leave packet data uninitialized

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Message-ID: <1400246202.7973.163.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 16 May 2014 06:16:42 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] pktgen: Add NOINIT option to leave packet data
 uninitialized

On Fri, 2014-05-16 at 12:34 +0200, Thomas Graf wrote:
> The memset() on the packet data is expensive and severely limiting
> the pps throughput for large frame sizes.
> 
> Considering that pktgen requires root privileges to run it is safe
> to introduce an option to optionally avoid the memset() and leave
> the packet data uninitialized.
> 
> VM test results, 2 VCPU, 2 threads, pkt_size=9K:
> 
>     12.44%  -11.15%  [kernel.kallsyms]   [k] memset
>      4.84%   +1.58%  [kernel.kallsyms]   [k] get_page_from_freelist
> 
> Signed-off-by: Thomas Graf <tgraf@...g.ch>
> ---
>  Documentation/networking/pktgen.txt |  3 +++
>  net/core/pktgen.c                   | 16 ++++++++++++++--
>  2 files changed, 17 insertions(+), 2 deletions(-)

We do not want to leak content of memory, even if 'root' is willing to.

Sorry, you need to do something else if you really care.


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