Message-Id: <5.1.0.14.2.20041122144144.04e3d9f0@171.71.163.14>
Date: Mon, 22 Nov 2004 14:44:59 +1100
To: "Jeff V. Merkey" <jmerkey@devicelogics.com>
From: Lincoln Dale <ltd@cisco.com>
Subject: Re: Linux 2.6.9 pktgen module causes INIT process respawning
  and sickness
Cc: "Jeff V. Merkey" <jmerkey@devicelogics.com>, linux-kernel@vger.kernel.org,
       jmerkey@drdos.com
In-Reply-To: <419E6E5D.2000709@devicelogics.com>
References: <419E6B44.8050505@devicelogics.com>
 <419E6B44.8050505@devicelogics.com>
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Jeff,

you're using commodity x86 hardware.  what do you expect?

while the speed of PCs has increased significantly, there are still 
significant bottlenecks when it comes to PCI bandwidth, PCI arbitration 
efficiency & # of interrupts/second.
linux ain't bad -- but there are other OSes which still do slightly better 
given equivalent hardware.

with a PC comes flexibility.
that won't match the speed of the FPGAs in a Spirent Smartbits, Agilent 
RouterTester, IXIA et al ...


cheers,

lincoln.

At 09:06 AM 20/11/2004, Jeff V. Merkey wrote:

>Additionally, when packets sizes 64, 128, and 256 are selected, pktgen is 
>unable to achieve > 500,000 pps (349,000 only on my system).
>A Smartbits generator can achieve over 1 million pps with 64 byte packets 
>on gigabit.  This is one performance
>issue for this app.  However, at 1500 and 1048 sizes, gigabit saturation 
>is achievable.
>Jeff
>
>Jeff V. Merkey wrote:
>
>>
>>With pktgen.o configured to send 123MB/S on a gigabit on a system using 
>>pktgen set to the following parms:
>>
>>pgset "odev eth1"
>>pgset "pkt_size 1500"
>>pgset "count 0"
>>pgset "ipg 5000"
>>pgset "src_min 10.0.0.1"
>>pgset "src_max 10.0.0.254"
>>pgset "dst_min 192.168.0.1"
>>pgset "dst_max 192.168.0.254"
>>
>>After 37 hours of continual packet generation into a gigabit regeneration 
>>tap device,
>>the server system console will start to respawn the INIT process about 
>>every 10-12
>>hours of continuous packet generation.
>>
>>As a side note, this module in Linux is extremely useful and the "USE 
>>WITH CAUTION" warnings
>>are certainly will stated.  The performance of this tool is excellent.
>>
>>Jeff

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