[netperf-talk] Problem with Bidirectional Test

[Rick Jones]

Ankit Goyal wrote:
> Thanks a ton guys!!
>  
> If possible could you tell me that how much max bidirectional throughput 
> I can get on 1Gbps ethernet connection?Can I get more than 1 Gig by 
> changing the drivers and kernel?
> I know its a very relative question but i will be glad if u help me out!

In theory you should be able to see O(1800) megabits/s.  Certainly that would be 
  my expectation in this day and age:


s7:/home/raj/netperf2_trunk# netperf -H sbs133b1.west. -t TCP_RR -f m -- -r 64K 
-s 256K -S 256K -m 32K -b 8
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to sbs133b1.west 
(10.208.1.20) port 0 AF_INET : first burst 8
Local /Remote
Socket Size   Request  Resp.   Elapsed
Send   Recv   Size     Size    Time     Throughput
bytes  Bytes  bytes    bytes   secs.    10^6bits/sec

262142 262142 65536    65536   10.00    1837.52
524288 524288

whether one will always get that with the paired TCP_STREAM/TCP_MAERTS test is 
an open question:

s7:/home/raj/netperf2_trunk# for i in 1; do netperf -t TCP_STREAM -l 60 -H 
sbs133b1.west -P 0 & netperf -t TCP_MAERTS -l 60 -H sbs133b1.west -P 0 & done
[1] 14619
[2] 14620
s7:/home/raj/netperf2_trunk#
  87380  16384  16384    60.02     713.28
  87380  16384  16384    60.01     874.86

s7:/home/raj/netperf2_trunk# for i in 1; do netperf -t TCP_STREAM -l 120 -H 
sbs133b1.west -P 0 & netperf -t TCP_MAERTS -l 120 -H sbs133b1.west -P 0 & done
[1] 14621
[2] 14622
s7:/home/raj/netperf2_trunk#
  87380  16384  16384    120.03    626.89
  87380  16384  16384    120.01    895.40

(FWIW, one of the systems involved there is several (4 or 5?) years old now)