<p dir="ltr">Check for ipstats or l2stats for clues. ...</p>
<div class="gmail_quot<blockquote class=" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I see, thanks! However, any suggestions how to see exactly which<br>
traffic causes CPU utilization of tNetTask process to increase? It<br>
looks like that in my case it's not the ICMP traffic which actually<br>
loads the tNetTask process.<br>
<br>
<br>
<br>
regards,<br>
Martin<br>
<br>
On 8/26/14, Shankar <<a href="mailto:shankarp5@gmail.com">shankarp5@gmail.com</a>> wrote:<br>
> ICMP traffic is always software forwarded in EWare....so the RTT is higher<br>
> when compared to other traffic that is hardware forwarded....<br>
><br>
> Regards,<br>
> Shankar<br>
> On 25 Aug 2014 20:56, "Martin T" <<a href="mailto:m4rtntns@gmail.com">m4rtntns@gmail.com</a>> wrote:<br>
><br>
>> Hi,<br>
>><br>
>> I have a legacy Extreme Networks Summit1iTx L3 switch(running EW<br>
>> 7.8.4.1), which delays ICMP traffic routed through the switch and ICMP<br>
>> traffic addressed to the switch while traffic switched through the<br>
>> switch is not affected. For an odd reason, only ICMP traffic seems to<br>
>> be affected and not for example TCP or UDP traffic. There is a clear<br>
>> correlation between high RTT and low CPU utilization(less than 90%) of<br>
>> tBGTask process. It is always the tNetTask process, which CPU usage<br>
>> increased and thus forced tBGTask process utilization below 90%.<br>
>> According to ExtremeWare 7.0 software manual, tNetTask(network stack<br>
>> task) process is responsible for handling all the software-based<br>
>> processing of packets including:<br>
>><br>
>> 1) Packets that cannot be handled by the switch's ASIC because the<br>
>> forwarding tables do not have entries built in.<br>
>> 2) Packets destined to the CPU for one of the router interfaces.<br>
>> 3) Packets that must be examined or snooped by the CPUPackets detected<br>
>> for copying to the CPU.<br>
>><br>
>> Has anyone seen such behavior before? Why does low CPU utilization of<br>
>> tBGTask process affect only ICMP traffic? Any suggestions how to see<br>
>> exactly which traffic causes CPU utilization of tNetTask process to<br>
>> increase?<br>
>><br>
>><br>
>><br>
>> thanks,<br>
>> Martin<br>
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>><br>
><br>
</div>