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libnetfilter_conntrack 0.0.99 (Default branch)
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nsysmap(5) File Formats Manual nsysmap(5) NAME
nsysmap, nsysmap64 - number of entries in a kernel dynamic memory allocation map VALUES
Default 8400 Allowed Values DESCRIPTION
Note: In HP-UX 11i Version 3, these tunables are no longer present. The system will establish an initial size for the table, and increase the size as needed. This manual page will be remove in a future release. Pre-Release 11i Version 3 Usage This value sizes the kernel dynamic memory resource map, an array of address/length pairs that describe the free virtual space in the ker- nel's dynamic address space. This array has historically been statically-sized. That means certain pathological workloads that fragment the kernel address space will result in too many entries for the array. Rather than panicking when this condition occurs, the system throws away the last entry, which results in "leaked" kernel virtual address space. If this overflow happens often enough, the system eventually runs out of virtual space and will panic with the following message: By making the map size tunable, the system can automatically scale the map size according to the system workload size and avoid this prob- lem. If the automatic scaling does not work, you can hand-tune to fit a particular workload. When the default value is overridden, the kernel may increase the value beyond the your specification depending on the system size. There are different tunables for 32- and 64-bit kernel because the 64-bit kernel has more virtual address space. The tunable controls 32-bit kernels and the tunable controls 64-bit kernels. WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
and were developed by HP. OBSOLETED
Tunable Kernel Parameters nsysmap(5)
