Chelsio T520-SO-CR low performance (netmap tested) for RX

[Marcus Cenzatti]

On 1/23/2016 at 4:38 PM, "Navdeep Parhar" <nparhar at gmail.com> wrote:
>
>On Sat, Jan 23, 2016 at 03:48:39PM -0200, Marcus Cenzatti wrote:
>...
>> 
>> woops, my bad, yes probably we had some drop, with -S and -D now 
>I get 1.2Mpps.
>
>Run "netstat -hdw1 -i cxl<n>" on the receiver during your test.  
>Do you
>see errs and/or idrops incrementing?  The input "packets" counter 
>should
>match what the transmitter is claiming to transmit at.
>
>Also check the output of this:
># sysctl -n dev.t5nex.0.misc.tp_err_stats
>It is ok if you see tnlCongDrops, but any of the Errs counter 
>going up
>is not good -- it means the incoming frames had errors.
>
>Do you know if the transmitter will pad up so as not to put runts 
>on the
>wire?  If not then you might want to bump up the size of the frame
>explicitly (there's some pkt-gen knob for this).
>
>Regards,
>Navdeep
>


the size frames I sent based on luigi's suggestions show some particular behaviour as you see it?

here is the output for netstat when I pkt-gen -f tx un-throttled (14Mpps):

            input        (Total)           output
   packets  errs idrops      bytes    packets  errs      bytes colls drops
      900k     0     0        55M          3     0        550     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          9     0       2.4K     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0
      900k     0     0        55M          3     0        422     0     0

as for the error stats:

# sysctl -n dev.t5nex.0.misc.tp_err_stats
                 channel 0  channel 1  channel 2  channel 3
macInErrs:          292496          0          0          0
hdrInErrs:               0          0          0          0
tcpInErrs:               0          0          0          0
tcp6InErrs:              0          0          0          0
tnlCongDrops:     30750953          0          0          0
tnlTxDrops:              0          0          0          0
ofldVlanDrops:           0          0          0          0
ofldChanDrops:           0          0          0          0

ofldNoNeigh:    0
ofldCongDefer:  0