total-TX and RX mismatch with drop-rate 0

[Wansoo Kim]

Hi,

I installed TREX on my PC (centOS 7.3, i5, 64G mem, SDD, 3 nic) and tested.
Regardless of loopback or connected to asr1k router, there is always mismatch with Total-TX and Total-RX while drop-rate 0.

For example, now total-tx is 43.54Mbps while total-rx is 40.88Mbps. Drop rate is 0.00bps.
From the router show command, all TX packet goes to another TREX interface.
It was same even tested with loopback. CPU util is around 2%.

I test with as
./.t-rex-64 -f cap2/imix_64.yaml -m 10 -d 100

How can I fix this issue?

Thanks in advance!!!

[hanoh haim]

Hi

TUI/Server Drop rate is based on global port counters bandwidth and we can't be sure that there is drop in the *middle* of the test. We are showing rx-rate - tx-rate only if it is greater than 5%. So zero does *not* mean zero drop.

You should use the Python API at the end of the test to be sure that there is a drop.

thanks, 

Hanoh

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Sent from my iPhone

[Wansoo Kim]

On Monday, May 8, 2017 at 4:54:59 PM UTC+9, Hanoch Haim wrote:
> Hi
>
>
>
> TUI/Server Drop rate is based on global port counters bandwidth and we can't be sure that
> there is drop in the *middle* of the test. We are showing rx-rate - tx-rate only
> if it is greater than 5%. So zero does *not* mean zero drop.
>
>
>
>
>
>
> You
> should use the Python API at the end of the test to be sure that there is a
> drop.
>
>
>
>
> thanks, 
>
>
> Hanoh
>
>
> On Mon, May 8, 2017 at 10:45 AM, Wansoo Kim <nonb...@gmail.com> wrote:
>
>
> Hi,
>
>
>
> I installed TREX on my PC (centOS 7.3, i5, 64G mem, SDD, 3 nic) and tested.
>
> Regardless of loopback or connected to asr1k router, there is always mismatch with Total-TX and Total-RX while drop-rate 0.
>
>
>
> For example, now total-tx is 43.54Mbps while total-rx is 40.88Mbps. Drop rate is 0.00bps.
>
> From the router show command, all TX packet goes to another TREX interface.
>
> It was same even tested with loopback. CPU util is around 2%.
>
>
>
> I test with as
>
> ./.t-rex-64 -f cap2/imix_64.yaml -m 10 -d 100
>
>
>
> How can I fix this issue?
>
>
>
>
>
> Thanks in advance!!!
>
>
>
> --
>
> You received this message because you are subscribed to the Google Groups "TRex Traffic Generator" group.
>

> To unsubscribe from this group and stop receiving emails from it, send an email to trex-tgn+u...@googlegroups.com.

>
> To post to this group, send email to trex...@googlegroups.com.
>
> To view this discussion on the web visit https://groups.google.com/d/msgid/trex-tgn/7c84f8de-e648-4d26-8d07-c36510108f58%40googlegroups.com.
>
> For more options, visit https://groups.google.com/d/optout.
>
>
>
>
>
> --
>
>
>
> HanohSent from my iPhone

Thanks Hanoh,

I came to find out that the packet loss is only at the beginning time of the packet test.
For 3~4 seconds, there are packet loss and after then, there is no packet loss.

So, I tried to fix out by static ARP but, the result is same.
Do you have any idea about that?

[hanoh haim]

Hi,

maybe it is due to  the link stability of your DUT/ Switch SPT 

try :

1) use  -k 10 or -w 10

2) Disable Switch Spanning tree 

thanks,

Hanoh

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For more options, visit https://groups.google.com/d/optout.

--

[Wansoo Kim]

On Wednesday, May 10, 2017 at 3:37:38 PM UTC+9, Hanoch Haim wrote:
> Hi,maybe it is due to  the link stability of your DUT/ Switch SPT 

> To view this discussion on the web visit https://groups.google.com/d/msgid/trex-tgn/878ba559-dd1b-4412-b65e-d8c0970d867f%40googlegroups.com.
>
>
>
> For more options, visit https://groups.google.com/d/optout.
>
>
>
>
>
> --
>
>
>
> HanohSent from my iPhone

with -w 10 option, it works.

Thanks so much!