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IB6054601-00 H E-1
E Write Combining
Introduction
Write combining improves write bandwidth to the QLogic chip by writing multiple
words in a single bus transaction (typically 64 bytes). Write combining applies only
to x86_64 systems.
The x86 Page Attribute Table (PAT) mechanism that allocates Write Combining
(WC) mappings for the PIO buffers has been added and is now the default.
If PAT is unavailable or PAT initialization fails, the code will generate a message in
the log and fall back to the Memory Type Range Registers (MTRR) mechanism.
If write combining is not working properly, lower than expected bandwidth may
occur.
The following sections provide instructions for checking write combining and for
using PAT and MTRR.
Verify Write Combining is Working
To see if write combining is working correctly and to check the bandwidth, run the
following command:
$ ipath_pkt_test -B
With write combining enabled, the QLE7140 and QLE7240 report in the range
of 1150–1500 MBps. The QLE7280 reports in the range of 1950–3000 MBps. The
QHT7040/7140 adapters report in the range of 2300–2650 MBps.
You can also use ipath_checkout (use option 5) to check bandwidth.
Although the PAT mechanism should work correctly by default, increased latency
and low bandwidth may indicate a problem. If so, the interconnect operates, but in
a degraded performance mode, with latency increasing to several microseconds,
and bandwidth decreasing to as little as 200 MBps.
Upon driver startup, you may see these errors:
ib_ipath 0000:04:01.0: infinipath0: Performance problem: bandwidth
to PIO buffers is only 273 MiB/sec
.
- OFED Software Users Guide 1
- Document Revision History 2
- QLogic OFED Version 1.4 13
- IB6054601-00 H Page xiii 13
- Page xiv IB6054601-00 H 14
- Table of Contents 15
- 5 Using QLogic MPI 16
- 6 Using Other MPIs 17
- List of Figures 22
- List of Tables 22
- 1 Introduction 23
- Overview 24
- Interoperability 25
- Convention Meaning 26
- Documentation 27
- Contact Information 27
- 1–Introduction 28
- 1-6 IB6054601-00 H 28
- 2 Feature Overview 29
- Other Changes 30
- Continued Support 30
- Table Notes 31
- PCIe is Gen 1 31
- Compiler Support 33
- Software Components 33
- 2–Feature Overview 34
- 2-6 IB6054601-00 H 34
- 3 Step-by-Step Cluster Setup 35
- Using MPI 36
- 4 InfiniPath Cluster Setup 37
- Installed Layout 38
- Memory Footprint 39
- 4-6 IB6054601-00 H 42
- # ifconfig ib0 42
- Using QLogic SRP 45
- Using OFED SRP 45
- IB6054601-00 H 4-11 47
- # ib_qlgc_vnic_query 47
- 4-12 IB6054601-00 H 48
- IB6054601-00 H 4-13 49
- 4-18 IB6054601-00 H 54
- $ ibv_devinfo 54
- InfiniPath Driver Filesystem 57
- Homogeneous Nodes 58
- Adapter and Other Settings 58
- Remove Unneeded Services 59
- Disable Powersaving Features 60
- Hyper-Threading 60
- Configuring for ssh 61
- The Intel Cluster Checker 67
- 4-32 IB6054601-00 H 68
- Other MPIs 70
- MPI-IO with ROMIO 70
- Getting Started with MPI 71
- QLogic MPI Details 73
- To Use Another Compiler 76
- Process Allocation 78
- 5–Using QLogic MPI 79
- IB6054601-00 H 5-11 79
- 5-12 IB6054601-00 H 80
- PSM_SHAREDCONTEXTS=0 80
- PSM_SHAREDCONTEXTS=NO 80
- Running in Shared Memory Mode 81
- Using mpirun 83
- Console I/O in MPI Programs 85
- Environment for Node Programs 85
- Environment Variables 86
- Name Description 87
- Performance Tuning 89
- MPD Description 91
- Using MPD 91
- Applications 92
- Debugging MPI Programs 93
- QLogic MPI Limitations 94
- Open MPI 97
- Running Open MPI Applications 98
- Running MVAPICH Applications 100
- Installation 102
- Compiling HP-MPI Applications 102
- Running HP-MPI Applications 102
- More Information on HP-MPI 102
- Platform (Scali) MPI 103
- Intel MPI 104
- IB6054601-00 H 6-13 107
- 6–Using Other MPIs 107
- 6-14 IB6054601-00 H 108
- A mpirun Options Summary 109
- Spawn Options 110
- Quiescence Options 111
- Verbosity Options 111
- Startup Options 111
- Stats Options 112
- Tuning Options 113
- Shell Options 114
- Debug Options 114
- Format Options 115
- Other Options 115
- A–mpirun Options Summary 116
- A-8 IB6054601-00 H 116
- B Benchmark Programs 117
- Between Two Nodes 119
- B–Benchmark Programs 122
- B-6 IB6054601-00 H 122
- C Integration with a Batch 123
- Using SLURM for Batch Queuing 124
- Allocating Resources 125
- Generating the mpihosts File 125
- Simple Process Management 126
- D Troubleshooting 129
- BIOS Settings 130
- SDP Module Not Loading 136
- Performance Issues 137
- Affinity on Opteron Systems 138
- MVAPICH Performance Issues 138
- Erratic Performance 139
- QLogic MPI Troubleshooting 140
- Mixed Releases of MPI RPMs 141
- Missing mpirun Executable 141
- Cross-Compilation Issues 142
- Compiler/Linker Mismatch 143
- Process Limitation with ssh 148
- Using MPI.mod Files 149
- Extending MPI Modules 149
- Queuing System 151
- General Error Messages 154
- MPI Messages 156
- MPI Stats 159
- D–Troubleshooting 160
- D-32 IB6054601-00 H 160
- E Write Combining 161
- PAT and Write Combining 162
- E–Write Combining 164
- E-4 IB6054601-00 H 164
- F Useful Programs and Files 165
- Table F-1. Useful Programs 166
- Program Name Function 166
- F–Useful Programs and Files 175
- IB6054601-00 H F-11 175
- # modprobe -v ib_ipath 175
- Common Tasks and Commands 177
- Function Command 178
- subdirectory of the 183
- F-20 IB6054601-00 H 184
- G Recommended Reading 185
- Clusters 186
- Networking 186
- Other Software Packages 186
- Glossary 187
- EE – kDAPL 188
- Glossary-2 IB6054601-00 H 188
- IB6054601-00 H Glossary-3 189
- Glossary-4 IB6054601-00 H 190
- IB6054601-00 H Glossary-5 191
- RDMA — uDAPL 191
- Glossary-6 IB6054601-00 H 192
- Numerics 193
- Index-2 IB6054601-00 H 194
- IB6054601-00 H Index-3 195
- Index-4 IB6054601-00 H 196
- IB6054601-00 H Index-5 197
- Index-6 IB6054601-00 H 198
- IB6054601-00 H Index-7 199
- Index-8 IB6054601-00 H 200
- IB6054601-00 H Index-9 201
- Index-10 IB6054601-00 H 202
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