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By decreasing the number of target objects per slab we increase the likelyhood that a slab can be freed. This reduces the level of fragmentation in the slab which has been observed to be a problem for certain workloads. The penalty for this is that we also decrease the speed which need objects can be allocated.
The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./configure
$ make pkg
Full documentation for building, configuring, and using the SPL can be found at: http://zfsonlinux.org