[DRBD-user] 10Gbe Network Latency

Roof, Morey R. MRoof at admin.nmt.edu
Wed Oct 5 00:04:06 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Hi Everyone,

After digging around more on my server performance issue it looks like
the latency the NICs I.m using are giving a big part of the problem.
Using netperf I.m seeing a round trip latency on the network of about 70
microseconds.  This seems quite high for some back-to-back 10Gbe NICs.
Can others post some latency numbers for 10Gbe networks and what brand
of NIC their using?

# netperf -t TCP_RR -H <targethost> -l 60 -C -c -v 2 -- -r 512,512 -s
256K -S 256K

Local /Remote
Socket Size   Request Resp.  Elapsed Trans.   CPU    CPU    S.dem
S.dem
Send   Recv   Size    Size   Time    Rate     local  remote local
remote
bytes  bytes  bytes   bytes  secs.   per sec  % S    % S    us/Tr
us/Tr

524288 524288 512     512    60.00   14143.30  1.56   1.55   8.849
8.772
524288 524288
Alignment      Offset         RoundTrip  Trans    Throughput
Local  Remote  Local  Remote  Latency    Rate     10^6bits/s
Send   Recv    Send   Recv    usec/Tran  per sec  Outbound   Inbound
    8      0       0      0   70.705   14143.299 57.931    57.931

Thanks,
Morey




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