IBM Sterling Connect:Direct : Performance on AIX
Currently in DRAFT!!!
AIX Tuning
Networking
Check the current values of the network tuning parameters:
no -a | more
or
ifconfig en0
en0:
...
tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
Tuning for Performance
| Adapter/MTU | 1G/1500 | 1G/9000 | 10G/1500 | 10G/9000 | - | Comments |
|---|---|---|---|---|---|---|
| tcp_sendspace | 131072 | 262144 | 262144 | 262144 | - | Consider increasing to 512K (524288) |
| tcp_recvspace | 65536 | 131072 | 262144 | 262144 | - | Consider increasing to 512K (524288) |
| udp_sendspace | 65536 | 65536 | 65536 | 65536 | - | Consider increasing to 64K if the workloads stress the UDP protocol. |
| udp_recvspace | 655360 | 655360 | 655360 | 655360 | - | Consider increasing to 640K if the workloads stress the UDP protocol. |
| rfc1323 | 0 | 1 | 1 | 1 | - | - |
Other Attributes
- ipv6 offload -> ipv6 offload are configured independently from ipv4 offload
- num of tx queues -> The number of transmit queues
- sz of tx queue -> The size of transmit queues
- num of rx queues -> The number of receive queues
- sz of rx queue -> The size of receive queues
- sz of sw tx queue -> The size of software transmit queue.
- intr_cnt -> Interrupt coalescing counter
- intr_time -> Interrupt coalescing timer (microseconds)
Sample commands:
/usr/sbin/no -o udp_sendspace=65536 /usr/sbin/no -o udp_recvspace=655360 /usr/sbin/no -o tcp_sendspace=262144 /usr/sbin/no -o tcp_recvspace=262144 /usr/sbin/no -o rfc1323=1 /usr/sbin/no -o sb_max=4194304 /usr/sbin/no -o ipqmaxlen=512
File descriptors (ulimit)
Specifies the various restrictions on resource usage on the user account.
Check the change with the following command
# ulimit -a ... open files (-n) 2000
Perform the following steps to change the open file limit to 10,000 files. Edit the /etc/security/limits file.
nofiles = 10000 nofiles_hard = 10000
Save and close the file, logoff from the system, and logon again