Re: ixg(4) performances

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

I quote myself here:

On Wed, Jul 02, 2014 at 02:05:53PM +0000, Emmanuel Dreyfus wrote:
> TCP connection established.
> Packet size  1k bytes:  114938 KByte/s Tx,  114816 KByte/s Rx.
> Packet size  2k bytes:  114924 KByte/s Tx,  114868 KByte/s Rx.
> Packet size  4k bytes:  114871 KByte/s Tx,  114901 KByte/s Rx.
> Packet size  8k bytes:  114877 KByte/s Tx,  114900 KByte/s Rx.
> Packet size 16k bytes:  114882 KByte/s Tx,  114914 KByte/s Rx.
> Packet size 32k bytes:  114881 KByte/s Tx,  114905 KByte/s Rx.

ioperf reports awful perfs.  But netperf says:

root@saccharose#  netperf -H 10.103.101.117
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.103.101.117 
(10.103.101.117) port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 32768  32768  32768    10.01    1152.76   

This look much better: maximum bandwith is 1200 Mb/s as I understand.

How can this be explained?


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost