IBM Systems Magazine, Mainframe edition - September/October 2013 - 45

RoCE in HCD for each physical
adapter port. System software and
firmware dynamically learn the
PNet ID associated with
each adapter.
In z/OS, a significant emphasis
was placed on usability. RoCE
features will not require additional software configuration or
individual operational procedures. Instead, they “inherit” the
OSA-Express definitions, such as
VLANs, and mimic OSA operations, including starting and
stopping OSA interfaces.

New Protocol
SMC-R
represents a new
“sockets over
RDMA” protocol
IBM created.
It’s intended
to become an
open, pervasive
industry protocol.

Performance Gains
So what performance gains are
possible with this protocol? One
is significant latency reduction
for workloads with a chatty
request/response message
patterns, such as application
servers to database servers. It
also offers a significant reduction
in CPU cycles consumed by the
networking stack for workloads
with streaming data patterns
where large amounts of data flow
in one direction, as with FTPs.

To measure the performance
benefits of SMC-R, IBM completed
several micro-benchmarks using
the IBM Application Workload
Modeler (AWM). Micro-benchmarks
focus on exercising the entire
networking path from a socketsapplication perspective (TCP
socket to TCP socket), but with no
application logic present to process
the data and perform businessrelated processing. As a result, the
benchmarks accurately depict the
best possible performance benefits
for the SMC-R protocol. With real
workloads, these benefits will likely
be smaller once application-specific
processing and associated latency
are introduced.
Micro-benchmarks comparing
SMC-R using the 10GbE RoCE
Express feature to TCP/IP using
10GbE OSA Express5 indicated
results upwards of:
Ā$
à Ãà QÃ80 percent drop in network
latency for request/response
traffic patterns
Ā$
à Ãà Ã60 percent decline in networking stack-related CPU cycles

ĀÃÃ Ã60 percent increase in
$
network throughput for streaming
workloads
These benefits were evident
on both server and client hosts,
demonstrating the efficiency of
SMC-R and RoCE in moving data
across the network. The sender can
move data more efficiently while
the receiver can receive data in a
big “chunk,” getting interrupted
less often to receive packets. The
receiver also generates significantly
fewer acknowledgements for the
sender to process. Both client and
server sides of these benchmarks
were performed on a zEC12
with dedicated OSA-Express and
RoCE Express features per LPAR
connected via a single 10GbE
Ethernet switch.
Ultimately, the combination
of SMC-R and the 10GbE RoCE
Express feature delivers compelling
improvements in network
performance with reduced latency,
improved throughput and CPU
cost while providing application
transparency.

Macro-benchmark Preliminary Results
BM undertook several macro-benchmarks to demonstrate the benefits of Shared Memory CommunicationsRemote Direct Memory Access (SMC-R) using key z/OS* middleware, such as CICS*, IMS*, DB2* and IBM
WebSphere*. While not complete when this issue went to press, a subset of these benchmark results included:

I

TradeLite Workload

CICS-to-CICS IP Interconnectivity (IPIC)

SCENARIO: A sample trading application hosted
in WebSphere Application Server (WAS) V8.0
using the Liberty Profile environment on one
z/OS LPAR, accessed data from a z/OS DB2
database in a separate z/OS LPAR using JDBC
drivers. The client, which isn’t a z/OS platform,
drove HTTP/REST requests into the WAS via
standard TCP/IP. WAS communications with DB2
using JDBC were tested with both standard TCP/
IP and SMC-R to demonstrate its performance
benefits for multitier applications.
RESULTS: The response time for each client HTTP
request was reduced up to 40 percent.

SCENARIO: A distributed program link was used to invoke programs
in remote CICS regions in another z/OS system via CICS IPIC
comparing SMC-R versus standard TCP/IP.
RESULTS: Response time dropped up to 48 percent, resulting in up
to 10 percent CPU savings for CICS transactions.

FTP Transfers Between z/OS Systems
SCENARIO: Bidirectional (i.e., GET and PUT) binary transfers of
1.2 GB files were performed using SMC-R versus TCP/IP.
RESULTS: An overall CPU savings of up to 50 percent over TCP/IP.
—P.D., G.K. and J.S.
ibmsystemsmag.com SEPTEMBER/OCTOBER 2013 // 45


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IBM Systems Magazine, Mainframe edition - September/October 2013

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe edition - September/October 2013

Table of Contents
Editor's Desk: zBC12 doesn't skip a beat
IBM Perspective: Strengthening the experience
Techbits: A microscopic short film
Partner PoV: End-to-end transaction management helps uncover and address CPU challenges
Q&A: 'Father of DB2' Don Haderle looks back-- and to the future
IT Today: Linux support for applications offers a compelling advantage
Case Study: Right Time, Right Place: ARBURG uses mainframe technology and SAP software to create an information-centric environment
Cover Story: Introducing zBC12 and IBM zEnterprise Innovations: New platform extends enterprise-class technologies to clients of all sizes, System z GM Pat Toole says
Feature: Stand Out From the Crowd: Latest zEnterprise extends innovation, performance and security to help businesses differentiate their customer service
Tech Corner: New zEDC Express adapter compresses data faster while using less CPU
Administrator: SMC-R protocol strengthens data sharing performance while reducing CPU costs
Solutions: ZEN TRACE & SOLVE; MegaCryption; Universal SSH Key Manager; TestBase
Stop Run: DB2 pioneer dances his way across the country
Reference Point - Global Events, Education, Resources for Mainframe
2014 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe edition - September/October 2013 - Intro
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover1
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover2
IBM Systems Magazine, Mainframe edition - September/October 2013 - 1
IBM Systems Magazine, Mainframe edition - September/October 2013 - Table of Contents
IBM Systems Magazine, Mainframe edition - September/October 2013 - 3
IBM Systems Magazine, Mainframe edition - September/October 2013 - 4
IBM Systems Magazine, Mainframe edition - September/October 2013 - 5
IBM Systems Magazine, Mainframe edition - September/October 2013 - Editor's Desk: zBC12 doesn't skip a beat
IBM Systems Magazine, Mainframe edition - September/October 2013 - 7
IBM Systems Magazine, Mainframe edition - September/October 2013 - IBM Perspective: Strengthening the experience
IBM Systems Magazine, Mainframe edition - September/October 2013 - 9
IBM Systems Magazine, Mainframe edition - September/October 2013 - Techbits: A microscopic short film
IBM Systems Magazine, Mainframe edition - September/October 2013 - 11
IBM Systems Magazine, Mainframe edition - September/October 2013 - Partner PoV: End-to-end transaction management helps uncover and address CPU challenges
IBM Systems Magazine, Mainframe edition - September/October 2013 - 13
IBM Systems Magazine, Mainframe edition - September/October 2013 - 14
IBM Systems Magazine, Mainframe edition - September/October 2013 - 15
IBM Systems Magazine, Mainframe edition - September/October 2013 - Q&A: 'Father of DB2' Don Haderle looks back-- and to the future
IBM Systems Magazine, Mainframe edition - September/October 2013 - 17
IBM Systems Magazine, Mainframe edition - September/October 2013 - 18
IBM Systems Magazine, Mainframe edition - September/October 2013 - 19
IBM Systems Magazine, Mainframe edition - September/October 2013 - IT Today: Linux support for applications offers a compelling advantage
IBM Systems Magazine, Mainframe edition - September/October 2013 - 21
IBM Systems Magazine, Mainframe edition - September/October 2013 - 22
IBM Systems Magazine, Mainframe edition - September/October 2013 - 23
IBM Systems Magazine, Mainframe edition - September/October 2013 - Case Study: Right Time, Right Place: ARBURG uses mainframe technology and SAP software to create an information-centric environment
IBM Systems Magazine, Mainframe edition - September/October 2013 - 25
IBM Systems Magazine, Mainframe edition - September/October 2013 - 26
IBM Systems Magazine, Mainframe edition - September/October 2013 - 27
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover Story: Introducing zBC12 and IBM zEnterprise Innovations: New platform extends enterprise-class technologies to clients of all sizes, System z GM Pat Toole says
IBM Systems Magazine, Mainframe edition - September/October 2013 - 29
IBM Systems Magazine, Mainframe edition - September/October 2013 - 30
IBM Systems Magazine, Mainframe edition - September/October 2013 - 31
IBM Systems Magazine, Mainframe edition - September/October 2013 - 32
IBM Systems Magazine, Mainframe edition - September/October 2013 - 33
IBM Systems Magazine, Mainframe edition - September/October 2013 - Feature: Stand Out From the Crowd: Latest zEnterprise extends innovation, performance and security to help businesses differentiate their customer service
IBM Systems Magazine, Mainframe edition - September/October 2013 - 35
IBM Systems Magazine, Mainframe edition - September/October 2013 - 36
IBM Systems Magazine, Mainframe edition - September/October 2013 - 37
IBM Systems Magazine, Mainframe edition - September/October 2013 - 38
IBM Systems Magazine, Mainframe edition - September/October 2013 - 39
IBM Systems Magazine, Mainframe edition - September/October 2013 - Tech Corner: New zEDC Express adapter compresses data faster while using less CPU
IBM Systems Magazine, Mainframe edition - September/October 2013 - 41
IBM Systems Magazine, Mainframe edition - September/October 2013 - 42
IBM Systems Magazine, Mainframe edition - September/October 2013 - Administrator: SMC-R protocol strengthens data sharing performance while reducing CPU costs
IBM Systems Magazine, Mainframe edition - September/October 2013 - 44
IBM Systems Magazine, Mainframe edition - September/October 2013 - 45
IBM Systems Magazine, Mainframe edition - September/October 2013 - Solutions: ZEN TRACE & SOLVE; MegaCryption; Universal SSH Key Manager; TestBase
IBM Systems Magazine, Mainframe edition - September/October 2013 - 47
IBM Systems Magazine, Mainframe edition - September/October 2013 - Stop Run: DB2 pioneer dances his way across the country
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover3
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover4
IBM Systems Magazine, Mainframe edition - September/October 2013 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE0
IBM Systems Magazine, Mainframe edition - September/October 2013 - 2014 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE2
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE3
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE4
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE5
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE6
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE7
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE8
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE9
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE10
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE11
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE12
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE13
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE14
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE15
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE16
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE17
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE18
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE19
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE20
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE21
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE22
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE23
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE24
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE25
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE26
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE27
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE28
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE30
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE31
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE34
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE35
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE37
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE40
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