HP IO Accelerator for BladeSystem c-Class Windows User Manual Page 67
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NUMA configuration 67
NUMA configuration
Introduction to NUMA architecture
Servers with NUMA (Non-Uniform Memory Access) architecture require special installation instructions in
order to maximize IO Accelerator device performance. These servers include the HP DL580 and the HP
DL980 server.
On servers with NUMA architecture, during system boot, the BIOS on some systems will not distribute PCIe
slots evenly among the NUMA nodes. Each NUMA node contains multiple CPUs. This imbalanced
distribution means that, during high workloads, half or more of the CPUs will remain idle while the rest are
100% utilized. To prevent this imbalance, you must manually assign IO Accelerator devices equally among
the available NUMA nodes.
Configuring the IO Accelerator devices for servers with NUMA architecture requires the use of the
FIO_AFFINTIY parameter with the fio-config utility.
FIO_AFFINITY parameter
The FIO_AFFINITY parameter is a list of <affinity specification> triplets that specify the affinity
settings of all adapters in the system. Each item in the triplet is separated by a comma, and each triplet set
is separated by a semicolon.
Syntax
fio-config -p FIO_AFFINITY <affinity specification>[;<affinity
specification>...]
Where each <affinity specification> has the following syntax:
<fct number>,[g|n]<group or node number>[,<hex mask>]
If there is no g or n character before the group or node number, then the number is assumed to be a group
number.
The hex mask is optional. If it is not present, the mask is assumed to be 0xffffffffffffffff. Also, the
0x prefix is optional.
If the hex mask is a node mask, then the mask is relative to the node, not the group to which the node belongs.
Simple example
fio-config -p FIO_AFFINITY 4,n1,0xf;5,n0;7,g1;9,g2,0xff0
This command creates the following:
Device Node/Group Processor Affinity
fct4
node 1
Processors 0 to 3 in the node (mask
0xf
)
fct5
node 0
All processors in the node (no hex mask)
fct7
group 1 All processors in the group (no hex mask)
fct9
group 2
Processors 4 to 11 in the group (mask
0xff0
)
- User Guide 1
- Contents 3
- Contents 4 4
- Contents 5 5
- About this guide 6
- Introduction 7
- Performance attributes 8
- Supported firmware revisions 9
- Supported hardware 9
- Introduction 10 10
- Windows Server environments 12
- Using the Setup Wizard 14
- Upgrading procedure 20
- Viewing the firmware version 23
- Performing the upgrade 23
- Outdated firmware check 26
- Defragmentation 26
- Silent install option 26
- Enabling PCIe power 27
- IO Accelerator naming 27
- Using installation logs 33
- Creating an installation log 34
- Creating an uninstall log 34
- Creating a patch install log 34
- Message Suggested solution 36
- Maintenance 37
- Enabling PCIe power override 38
- Maintenance 39 39
- Maintenance 40 40
- Utilities 41
- • Date (20090921) 43
- Utilities 49 49
- Utilities 50 50
- • Use the -d or -s option 52
- Health metrics 54
- Health monitoring techniques 54
- Trim support 57
- Starting and stopping Trim 58
- Enabling Trim 58
- Trim configurations 59
- Accelerator 60
- Non-paged memory pool 61
- Windows page file management 62
- Virtual Memory performance 64
- Performance and tuning 65
- Setting NUMA affinity 66
- NUMA configuration 67
- Checking the log for errors 69
- Resources 70
- Support and other resources 71
- Customer Self Repair 73
- Reparo feito pelo cliente 75
- Regulatory information 79
- Acronyms and abbreviations 80
- Virtual Machine 81
- Documentation feedback 82
- Index 83 83
- Index 84 84
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