[CentOS] Network Performance

Mon Apr 30 19:05:51 UTC 2018
Pete Biggs <pete at biggs.org.uk>

> There were dozens of examples of such ftp tests with varying
> block sizes, bidirectional transfers, destination files on
> RAID storage, and a mix of some system loading programs run
> independently and during the network performance testing.
> Also archived were a full complement of network tests with
> what looks like the original ttcp and possibly newer versions.

ttcp morphed into iperf.

> These utilities looked like they would work on our CentOS 6
> systems, but we did not find ttcp and the ftp tests failed.
> the piping from dd failed with a message indicating that:
> |dd was not a recognized file.


ftp> put |"dd if=/dev/zero bs=32768 count=8000" /dev/null

> We no longer have available CentOS systems with versions of
> the OS before CentOS 6.  Could there have been a change to
> ftp that will not allow a source file specified in this way
> or would this transfer method have never worked on Linux?
It works, just the semantics are a bit different.