Very low write-performance and troubles with RPM

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Hi.

I am in the process of migrating to nilfs2 for my root-filesystem
running Fedora-19-alpha.
Basically the system works quite fine, except:

1. RPM checks for free inodes prior installing a package, which
doesn't make any sence of course.
I can pass "--ignoresize" to RPM which disables those checks, however,
I haven't found any way to disable it when using the "yum" package
manager.
Is there any way to make nilfs2 report a large number of unused inodes
instead of "0"?

2. Write-operations are very slow (a few mb/s) and a lot of time is
spent inside:
- segctord
- the application performing the filesystem operations.

I've recorded a system-wide profile of extracting a tar archive as
well as a larger delete operation (rm):
https://plus.google.com/photos/118350688762629274389/albums/5870410083987119137?authkey=CPu0iK2TiOWsoQE

Any idea what could be going wrong here?

Thank you in advance, Clemens

PS: I am using nilfs-utils-2.1.4-3.fc19.x86_64 and linux
3.9.0-0.rc6.git2.3.fc19.x86_64.
the root-filesystem is an encrypted luks container (worked quite will
with ext4, so don't think this is causing the issue)
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