On 10/25/13 09:38, Matthew Ahrens wrote:
On Wed, Oct 23, 2013 at 12:21 PM, Steven Hartland
<[email protected] <mailto:[email protected]>> wrote:
I've been looking through the http://open-zfs.org/wiki/__Features
<http://open-zfs.org/wiki/Features>
list today, updating a few things and have noticed a few items
which the ZFS On Linux folks have implemeted that currently
aren't in FreeBSD.
I've ported a couple simple ones today but the following few
I'm not as familar with the code area with so would appreciate
some feedback on.
FASTWRITE Algorithm: Improves synchronous IO performance.
https://github.com/zfsonlinux/__zfs/commit/__920dd524fb2997225d4b1ac180bcbc__14b045fda6
<https://github.com/zfsonlinux/zfs/commit/920dd524fb2997225d4b1ac180bcbc14b045fda6>
This idea seems promising. I haven't looked at the code.
Use the slog even with logbias=throughput
https://github.com/zfsonlinux/__zfs/commit/__5d7a86d114c2706a8d14d94b71f81a__d5cdf066c5
<https://github.com/zfsonlinux/zfs/commit/5d7a86d114c2706a8d14d94b71f81ad5cdf066c5>
This makes sense to me. I would suggest porting this first since it's
simpler and easy to understand.
--matt
Both of these changes significantly improved synchronous write
performance under Linux when using a ZIL device. There have been no
reported adverse effects. We would love further review of these changes
by the community.
Thanks,
Brian
Regards
Steve
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