[SATLUG] 10GbE configuration and performance issues

[Bruce Dubbs]

Gregory Alan Hildstrom wrote:
> Hello. I am working on an application that needs 200MB/s sustained
> iSCSI throughput for high speed data acquisition.
> 

> I ran netserver on the server and "netperf -H 192.168.2.151" on the
> client. I got 1550Mb/s, but I was expecting something more like
> 3-4Gb/s. CPU load on the slower client machine never got above 25%
> and I do not know how to measure PCI bus bandwidth utilization.

I don't know how to solve the network issue, but be sure that your disk
drives can handle that much data or that you can buffer the data in RAM.

For instance, my SATA drive only gives:

/sbin/hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   4404 MB in  2.00 seconds = 2200.13 MB/sec
 Timing buffered disk reads:  172 MB in  3.02 seconds =  56.92 MB/sec

Writing probably is slower.

  -- Bruce