Re: Is there any way to increase the KVM?
- From: John Baldwin <jhb@xxxxxxxxxxx>
- Date: Sat, 31 May 2008 12:49:53 -0400
On Saturday 31 May 2008 01:52:56 am Tz-Huan Huang wrote:
Hi,
Our nfs server is running 7-stable/amd64 with 8G ram, the size of zfs
pool is 12T. We have set vm.kmem_size and vm.kmem_size_max to
1.5G, but the kernel still panics by "kmem_map too small" often.
According to [1], the limitation is not only by the loader (is it fixed
now?) but also by the default layout of KVM. [2] points a way to increase
the KVM, but we get the similar linking error.
Is there any standard way to modify the layout of KVM? For example, we
may want to set KVM to 6G and leave the 2G for user space usage.
On i386 you only have 4GB of virtual address space period. For amd64 you can
jack up KVM just fine AFAIK. The mcmodel=kernel stuff should only affect
global variables (so .data and .bss) and not malloc'd stuff. Have you tried
increasing the KVM size and seeing what happens?
--
John Baldwin
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