[rds-devel] RDS issue

[Karun Sharma (Contractor - GS Labs)]

Hello:

The issue I am facing is while running qperf with -m option for testing RDS . "-m" is used to specify message size. What I observed is that till "15M", it works fine but if I increase the message size to "16M", the test gives me 0 bytes/sec result. (see below)

I checked the internet and OFED mailing list, but couldn't find anything which limits the message size. Is there any limit on message size or is it a bug? Any views?

Thanks
Karun

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[root at nsgib84 ~]# qperf 192.168.200.92 -v -m 15M rds_bw
rds_bw:
    bw              =   354 MB/sec
    msg_rate        =  22.4 /sec
    msg_size        =    15 MiB (15,728,640)
    send_cost       =  2.29 sec/GB
    recv_cost       =  1.05 sec/GB
    send_cpus_used  =  82.6 % cpus
    recv_cpus_used  =    37 % cpus
[root at nsgib84 ~]# qperf 192.168.200.92 -v -m 16M rds_bw
rds_bw:
    bw             =    0 bytes/sec
    msg_size       =   16 MiB (16,777,216)
    loc_cpus_used  =  100 % cpus
    rem_cpus_used  =  0.5 % cpus
[root at nsgib84 ~]#
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