Red Hat APPLICATION STACK 1.1 RELEASE Manuale Utente Scaricare il pdf (Pagina 15)

Feature Overview

NFS

The following NFS functionality has been added to the 1.1 release:

• NFS version 3client andserver support.SGI Linux Environment 1.0had NFS server

version 2 implemented in user space without any support for locking.

• Network Lock Manager (NLM) version 4 client and server support.

• Kernel level NFS and NLM implementation.

NFS and NFSD are conﬁgured as modules by default, but they can be conﬁgured to

compile as part of the kernel by setting the CONFIG_NFS_FS and CONFIG_NFSD

conﬁgurationparameters.TheCONFIG_NFS_V3parameteris set by default and can be

turned off if the user wants to use NFS version 2 only. The CONFIG_NFSD parameter

needs to be conﬁgured for LOCKD to work, so if CONFIG_LOCKD is set,

CONFIG_NFSD should be set also.

Kernel Spinlock Metering

The SGI Linux Environment 1.1 release includes a feature that allows developers to

gather statistical information about the SMP kernel’s use of spinlocks and mrlocks

(multiple-readersingle-writer spinlocks). This functionality is called spinlock metering,or

lockmetering.

Spinlock metering is built into the kernel using the CONFIG_LOCKMETER

conﬁguration option (in the Kernel Hacking section of make xconfig). A kernel built

withlockmetering will exhibit asmall (roughly1%) performancedegradation relativeto

a kernel that is not conﬁgured for lockmetering. See the following URL for additional

information:

http://oss.sgi.com/projects/lockmeter

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Red Hat APPLICATION STACK 1.1 RELEASE Manuale Utente Pagina 15