Re: Linux 2.6.9 pktgen module causes INIT process respawning and sickness

[Lincoln Dale]

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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