pktgen crash with 2.6.30

pktgen crash with 2.6.30

[Or Gerlitz]

using the conf-1-1 script over 2.6.30 I came across this crash in few seconds,
I have found a sign for a similar report in the archives nor any fix in the
2.6..30 stable tree, did other people see this as well?

pktgen v2.70: Packet Generator for packet performance testing.
BUG: spinlock bad magic on CPU#0, kpktgend_0/21800
 lock: ffff880215d27418, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
Pid: 21800, comm: kpktgend_0 Not tainted 2.6.30 #1
Call Trace:
 [<ffffffff8032959f>] ? _raw_spin_lock+0x22/0x122
 [<ffffffffa04a11f6>] ? pktgen_thread_worker+0xf45/0x126e [pktgen]
 [<ffffffffa03ba037>] ? vlan_dev_hwaccel_hard_start_xmit+0x0/0x65 [8021q]
 [<ffffffff8049ee1e>] ? thread_return+0x3e/0x97
 [<ffffffff80246cda>] ? autoremove_wake_function+0x0/0x2e
 [<ffffffffa04a02b1>] ? pktgen_thread_worker+0x0/0x126e [pktgen]
 [<ffffffffa04a02b1>] ? pktgen_thread_worker+0x0/0x126e [pktgen]
 [<ffffffff80246bd0>] ? kthread+0x54/0x84
 [<ffffffff8020bdba>] ? child_rip+0xa/0x20
 [<ffffffff804a065b>] ? _spin_unlock_irq+0xb/0xc
 [<ffffffff80246b7c>] ? kthread+0x0/0x84
 [<ffffffff8020bdb0>] ? child_rip+0x0/0x20


Or.

the maximal speed of pktgen with 1Gbps NIC

[jon_zhou]

hi 

anyone knows the maximal speed of pktgen with 1Gbps NIC?

on my pc, the maximal  speed is 500 Mbps when the packet size is 100 bytes(with boardcom 5755)

possibly more fast?



Regards,
zhou rui

Re: the maximal speed of pktgen with 1Gbps NIC

[Jesper Dangaard Brouer]

On Wed, 22 Jul 2009, jon_zhou@agilent.com wrote:

> anyone knows the maximal speed of pktgen with 1Gbps NIC?

You are limited by the number of packets per second (pps) your machine can 
generate.  This limitation is given by the CPU speed and the NIC used.

The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps.

1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps.
(1000*10^6/(64*8) = 1953125)

> on my pc, the maximal  speed is 500 Mbps when the packet size is 100 bytes(with boardcom 5755)

cat /proc/net/pktgen/ethXX to see how many pps pktgen is generating.

Quick calc tells me you a doing 625 kpps (500*10^6/(100*8) = 625000).


Cheers,
   Jesper Brouer

--
-------------------------------------------------------------------
MSc. Master of Computer Science
Dept. of Computer Science, University of Copenhagen
Author of http://www.adsl-optimizer.dk
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Re: the maximal speed of pktgen with 1Gbps NIC

[Ben Hutchings]

On Wed, 2009-07-22 at 14:56 +0200, Jesper Dangaard Brouer wrote:
> On Wed, 22 Jul 2009, jon_zhou@agilent.com wrote:
> 
> > anyone knows the maximal speed of pktgen with 1Gbps NIC?
> 
> You are limited by the number of packets per second (pps) your machine can 
> generate.  This limitation is given by the CPU speed and the NIC used.
> 
> The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps.
> 
> 1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps.
> (1000*10^6/(64*8) = 1953125)
[...]

You need to take the inter-packet gap into consideration too.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: the maximal speed of pktgen with 1Gbps NIC

[Bob Gilligan]

Ben Hutchings wrote:
> On Wed, 2009-07-22 at 14:56 +0200, Jesper Dangaard Brouer wrote:
>> On Wed, 22 Jul 2009, jon_zhou@agilent.com wrote:
>>
>>> anyone knows the maximal speed of pktgen with 1Gbps NIC?
>> You are limited by the number of packets per second (pps) your machine can 
>> generate.  This limitation is given by the CPU speed and the NIC used.
>>
>> The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps.
>>
>> 1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps.
>> (1000*10^6/(64*8) = 1953125)
> [...]
> 
> You need to take the inter-packet gap into consideration too.

Yes.  Usually when people talk about the "64-byte PPS rate" they are 
referring to the maximum rate of minimum size ethernet frames.  The 
64-bytes includes the src/dst addr fields, type field and CRC, but does 
not include the preamble (7 bytes), SOF (1 byte) or IPG (12 bytes). 
Adding these in  gives a minimum size frame of 84 bytes.  This works out 
to a max rate of ( 1,000,000,000 / (84 * 8) ) = 1,488,095 PPS.

Bob.

Re: the maximal speed of pktgen with 1Gbps NIC

[Stephen Hemminger]

On Wed, 22 Jul 2009 17:12:32 +0200
Ben Hutchings <bhutchings@solarflare.com> wrote:

> On Wed, 2009-07-22 at 14:56 +0200, Jesper Dangaard Brouer wrote:
> > On Wed, 22 Jul 2009, jon_zhou@agilent.com wrote:
> > 
> > > anyone knows the maximal speed of pktgen with 1Gbps NIC?
> > 
> > You are limited by the number of packets per second (pps) your machine can 
> > generate.  This limitation is given by the CPU speed and the NIC used.
> > 
> > The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps.
> > 
> > 1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps.
> > (1000*10^6/(64*8) = 1953125)
> [...]
> 
> You need to take the inter-packet gap into consideration too.
> 
> Ben.

Speed	Packets/sec	TCP MByte/sec
 10 M	    14880.95	     1,170,351
100 M	   148809.52	    11,703,511
  1 G	  1488095.24	   123,755,256
 10 G	 14880952.38	 1,237,552,556
 40 G	 59523809.52	 4,950,210,224
100 G	148809523.81	12,375,525,559

* TCP assumes timestamp option and jumbo frames if possible.


http://www.erg.abdn.ac.uk/users/gorry/course/lan-pages/enet-calc.html
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