On 2013-03-07, Akemi Yagi amyagi@gmail.com wrote:
You may want to check this out:
http://bugs.centos.org/view.php?id=6087
My understanding is that "There is no side effect other than the load. There are not performance issues with the ailds behaving like this." Is this not the case ?
As far as I can tell, it is. I actually prompted Dave's quoted comment on the XFS list:
http://oss.sgi.com/archives/xfs/2012-11/msg00594.html
So this would be a low priority task for me (as well as a learning exercise). If the patch were two lines I probably wouldn't bother. ;-) It is 99.5% cosmetic, but I have noticed that the ''baseline'' load, when there is no I/O, varies between 3 and 4, which makes it very slightly more difficult to interpret the load. That is my main motivation for bothering--if the baseline were more stable I probably wouldn't bother. (With fewer XFS filesystems mounted the issue is even less obvious.)
The wiki article:
http://wiki.centos.org/HowTos/BuildingKernelModules
may not be quite up-to-date in that it does not reflect the kernel version for CentOS 6 (2.6.32). But the principle is there. For building your own modules, you can also download one of the kmod packages from ELRepo and study how it's done.
Perfect, thank you! If people are interested, and I do make the attempt, I will post my results.
--keith