• TMPFS

TMPFS is now in -Current tree under /src/sys/fs/tmpfs.

Porting TMPFS

TmpFS is first developed by Julio M. Merino Vidal for NetBSD as a SoC project: Efficient memory file-system. Rohit Jalan ported it from NetBSD to FreeBSD. Now HowardSu and Glen Leeder ( glen.leeder@nokia.com ) and XinLi are working on it to continue this effort.

Todo List

• Refine and improve locking.
• Support unionfs, tmpfs can be used as an upper filesystem.
• Extra attribute support

Testing Status

Regression Testing

We port NetBSD regression test cases.

All tests sucessful.

POSIX Correctness Testing

All tests successful. Files=184, Tests=3353, 823 wallclock secs (29.94 cusr + 368.38 csys = 398.31 CPU)

Stress Testing

Survive after fsstress -n 10000 -p 50. Tested under AMD64/i386.

Any pressure testing in SMP box are highly welcomed.

Buildworld testing

We successfully build world to a tmpfs in 4-CPU box with -j32.

fsx Testing

fsx(tools/regression/fsx) is a tool to test the correctness of a filesystem read/write. It tests read, write, truncate, mmapread, mmapwrite, hole/extend write.

We passed fsx testing now.

Performance Testing

The vacache code is removed. sf_buf is used for data I/O. The performance will depends on sf_buf implementation in different platform. In Amd64, sf_buf is zero copy however i386 is not. So you will notice a performance difference.