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Brian Behlendorf
2b2861362f
When writing via ->writepage() the writeback bit was always cleared as part of the txg commit callback. However, when the I/O is also being written synchronsously to the zil we can immediately clear this bit. There is no need to wait for the subsequent TXG sync since the data is already safe on stable storage. This has been observed to reduce the msync(2) delay from up to 5 seconds down 10s of miliseconds. One workload which is expected to benefit from this are the intermittent samba hands described in issue #700. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #700 Closes #907
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
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-...
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org