[CentOS] iSCSI best practices

Sat Dec 10 18:58:05 UTC 2011
Ross Walker <rswwalker at gmail.com>

On Dec 10, 2011, at 1:49 PM, "James A. Peltier" <jpeltier at sfu.ca> wrote:

> Jumbo frames is really the important thing when it comes to iSCSI.  Having 9000 byte packets verses 1500 byte packets will dramatically increase your performance per interrupt.  Most cheaper unmanaged switches cannot do this.

I want to break the myth here, jumbo frames are really only important for 10Gbe+. On 1Gbe (or slow CPUs) they actually slow sequential throughput due to the time to process each packet on 1Gbe and how that in turn slows down  packet interleaving and thus total throughput.