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Hello Mike<br>
<br>
Please use ether etherlab-user mailing list for such things.<br>
<br>
<br>
Am 22.03.2012 00:17, schrieb Mike O'Connor:
<blockquote cite="mid:4F6A61A5.3070601@oeg.com.au" type="cite">
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Hi Andreas<br>
<br>
Yep 4K is no problem is higher that is a problem. We have 2 bus
couplers in a daisy chain on my test rig, and 4 IO modules.<br>
<br>
</blockquote>
Very small system.<br>
<br>
<blockquote cite="mid:4F6A61A5.3070601@oeg.com.au" type="cite"> I'll
try a different card soon, but I've used both the generic and non
generic Intel drivers with no different in the possible rates.<br>
<br>
</blockquote>
If you use the same card (Intel) there will be no difference, because
it is the same firmware on the card, which is the reason for the
problem.<br>
<br>
<blockquote cite="mid:4F6A61A5.3070601@oeg.com.au" type="cite"> 4K
works great doubling it to 8K the SKIPPED goes though the roof, as I
said I've confirmed the bus coupler is not an issue the issue is the PC
not doing the right thing with the packets.<br>
<br>
I just really want to now what sort of rate could be achievable with
etherlab. The packet captures I've seen seem to indicate that the bus
couplers are able to run a very high rate. (ie at least 25K)<br>
<br>
</blockquote>
I ran userspace (preempt) targets with up to 10k, 20k is also possible,
depends a little bit on your computer.<br>
<br>
<br>
<br>
Greatings<br>
<br>
Andreas<br>
<br>
<blockquote cite="mid:4F6A61A5.3070601@oeg.com.au" type="cite"> Mike<br>
<br>
<br>
On 21/03/12 11:13 PM, Andreas Stewering-Bone wrote:
<blockquote class=" cite" id="mid_4F69CCF1_5090800_igh_essen_com"
cite="mid:4F69CCF1.5090800@igh-essen.com" type="cite">Hello Mike, <br>
<br>
The max rate depends on your bus topology (Number of Slaves, Number of
EKXXX modules). <br>
Generally 4K should be no problem. <br>
<br>
But if you have the possibility, please do not use Intel cards, try a
stupid Realtek card. <br>
Intel cards are known to have some freatures which can make some
trouble at higher rate. <br>
<br>
Do not use the generic interface for such rates, please use the native
drivers. <br>
<br>
Greatings <br>
<br>
Andreas <br>
<br>
Am 21.03.2012 13:25, schrieb Mike O'Connor: <br>
<blockquote class=" cite" id="Cite_0" type="cite">Hi All <br>
<br>
I have been testing with Etherlab and a small number of Beckhoff
Digital <br>
IO, the Ethercat (not Etherlab) technical data seems to indicate that
an <br>
updates at a rate of at least 30 micro seconds for up to 1000 IO points
<br>
(possibly faster for smaller numbers) is possible. <br>
<br>
I adjusted the user land examples to work with our IO and then started <br>
increasing the frequency and found that at 4K I get no issue (maybe a <br>
couple of the dmesg messages below at the start) <br>
<br>
[ 412.872048] EtherCAT WARNING: Datagram f6bbfc00 (domain0-0) was <br>
SKIPPED 6 times. <br>
<br>
but as I increase the rate to 8K then 12K and finally 25K the number of
<br>
SKIPPED gets larger and larger <br>
<br>
[173178.785515] EtherCAT WARNING: Datagram f6851360 (domain0-0) was <br>
SKIPPED 43476 times. <br>
<br>
I did adjust the intel GigE driver (e1000e) to use a <br>
InterruptThrottleRate of 0 which helped a lot with consistency. I also <br>
tried the non generic drive with no change in the above messages. <br>
<br>
I've confirmed via a mirror port on a switch and a capture of the <br>
packets that the IO is replying to every packet we send and that the <br>
rate of sending would seem to match the 8K, 12K, and 25K. <br>
<br>
This seems to indicate to me that the issue is in the Ethercat master, <br>
is etherlab up to the task of running a high scan rate ? <br>
<br>
Thanks <br>
Mike <br>
<br>
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<br>
</blockquote>
<br>
<br>
Mit freundlichem Gruß <br>
<br>
Andreas Stewering-Bone <br>
<br>
</blockquote>
<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">Mit freundlichem Gruß
Andreas Stewering-Bone
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