bdfbe594a1
By default maximal number of objects in slab can't exceed (16*2 - 1) and slab size can't exceed 32M. Today's high end servers having couple hundreds of RAM available for ARC may run into a trouble with virtual memory because of the restriction mentioned above. Problem: Reasons for very high number of virtual memory allocations: * Real slab size very small relative to the size of the entire RAM * Slabs allocated on virtual memory and fill entire ARC The result is very high number of allocated virtual memory ranges (hundreds of ranges). When virtual memory subsystem manages high number of ranges its performance become so poor that it freezes from time to time. Solution: Number of objects per slab should be increased taking into account maximal slab size which can also be increased if needed. Signed-off-by: Andrey Vesnovaty <andrey.vesnovaty@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #337 |
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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 do not want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./configure
$ make pkg
If you are building directly from the git tree and not an officially released tarball you will need to generate the configure script. This can be done by executing the autogen.sh script after installing the GNU autotools for your distribution.
To copy the kernel code inside your kernel source tree for builtin compilation:
$ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
$ ./copy-builtin /usr/src/linux-...
The SPL comes with an automated test suite called SPLAT. The test suite is implemented in two parts. There is a kernel module which contains the tests and a user space utility which controls which tests are run. To run the full test suite:
$ sudo insmod ./module/splat/splat.ko
$ sudo ./cmd/splat --all
Full documentation for building, configuring, testing, and using the SPL can be found at: http://zfsonlinux.org