Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Scaricare il pdf (Pagina 247)

Chapter 13. Miscellaneous tasks 227

/sys/devices/system/cpu/cpu5

/sys/devices/system/cpu/cpu6

/sys/devices/system/cpu/cpu7

/sys/devices/system/cpu/cpu8

/sys/devices/system/cpu/cpu9

After a few more minutes, all of the CPUs should be activated.

4. Kill the processes with the killall command, then verify that the loops have stopped:

# killall cat

bash: line 1: 2450 Terminated cat /dev/zero > /dev/null

bash: line 1: 2452 Terminated cat /dev/zero > /dev/null

bash: line 1: 2451 Terminated cat /dev/zero > /dev/null

bash: line 1: 2457 Terminated cat /dev/zero > /dev/null

bash: line 1: 2456 Terminated cat /dev/zero > /dev/null

[1] Exit 143 bash -c "cat /dev/zero > /dev/null"

[2] Exit 143 bash -c "cat /dev/zero > /dev/null"

...

# pstree -G | grep cat

No output shows that the processes to create a workload have been stopped.

13.7.3 Setting memory sizes with cpuplugd

Memory sizes can also be set by the cpuplugd service. However, unlike CPUs, there is no

good generic default value. The following example is in the Device Drivers book:

MEMPLUG = "swaprate > freemem+10 & freemem+10 < apcr"

MEMUNPLUG = "swaprate > freemem + 10000"

However, this is just a starting point to explain the syntactical structure of a rule. Do not use

this configuration in production. You should test any setting that you want to implement

against a representative workload that your Linux systems will be running. The details of this

topic are beyond the scope of this book.

13.8 Hardware cryptographic support for OpenSSH

This section shows how to copy a test file with OpenSSH, first without any crypto

acceleration, and then crypto acceleration for OpenSSH is enabled and the same file is

copied again. A much higher throughput rate should be observed. The prerequisite for using

hardware cryptography is to have a firmware level of LIC 3863 installed on your System z

CPC.

This section is based on the white paper First experiences with hardware cryptographic

support for OpenSSH with Linux for System z, by Gnirss, et al. It can be found at the following

address:

http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP101690

This section only shows a single example of crypto acceleration. For a much more complete

and detailed analysis, refer to the white paper.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 247