[rds-devel] RDS issue
Andy Grover
andy.grover at oracle.com
Fri May 22 16:39:45 PDT 2009
Hi Karun,
There is a message size limit of 1MB, but this is not enforced in the
code. This is bad and should be fixed, but your 16MB issue thus is not
an RDS bug :)
It's kind of curious that 16MB fails... could this be an IB limitation,
I wonder?
Regards -- Andy
Karun Sharma (Contractor - GS Labs) wrote:
> 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
>
> --------------------------------------------------------------------------------------------
> [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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