diff options
| -rw-r--r-- | sys/boot/common/loader.8 | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/sys/boot/common/loader.8 b/sys/boot/common/loader.8 index 2ee850b..fed7225 100644 --- a/sys/boot/common/loader.8 +++ b/sys/boot/common/loader.8 @@ -414,28 +414,36 @@ Limits the amount of KVM to be used to hold swap meta information, which directly governs the maximum amount of swap the system can support. This value is specified in bytes of KVA space -and defaults to around 70MBytes. Care should be taken +and defaults to around 70MBytes. +Care should be taken to not reduce this value such that the actual amount of configured swap exceeds 1/2 the -kernel-supported swap. The default 70MB allows +kernel-supported swap. +The default 70MB allows the kernel to support a maximum of (approximately) -14GB of configured swap. Only mess around with +14GB of configured swap. +Only mess around with this parameter if you need to greatly extend the KVM reservation for other resources such as the -buffer cache or NMBCLUSTERS. Modifies -.Va VM_SWZONE_SIZE_MAX +buffer cache or +.Va NMBCLUSTERS . +Modifies +.Va VM_SWZONE_SIZE_MAX . .It Va kern.maxbcache Limits the amount of KVM reserved for use by the -buffer cache, specified in bytes. The default -maximum is 200MB. This parameter is used to +buffer cache, specified in bytes. +The default maximum is 200MB. +This parameter is used to prevent the buffer cache from eating to much KVM in large-memory machine configurations. Only mess around with this parameter if you need to greatly extend the KVM reservation for other resources -such as the swap zone or NMBCLUSTERS. Note that +such as the swap zone or +.Va NMBCLUSTERS . +Note that the NBUF parameter will override this limit. Modifies -.Va VM_BCACHE_SIZE_MAX +.Va VM_BCACHE_SIZE_MAX . .It Va machdep.pccard.pcic_irq Overrides the IRQ normally assigned to a PCCARD controller. Typically the first available interrupt will be allocated, |
