Email: cy@FreeBSD.org

With all the projects on the go I wish I could clone msyelf.

Things I am working on are:

• A working low level USB floppy format function.
• A number of screen port fix-ups.
• Various ports are confused between MIT and base system (Heimdal) Kerberos libraries.
• ZFS Tuning on small memory hardware. See ZFSTuningGuide.

The following should probably go into its own wiki page. I'll put it here when I have a better idea of what is happening:

• First ZFS problem:
  • I'm getting ZFS corruption in a zpool on my testbed. Shortly prior to or after that I see console messages in regard to g_vfs_done errors with large offsets or negative offests on one of my UFS2 filesystems.
  • Another issue I'm having is writing to a UFS filesystem on a ZVOL:
    • Tracing pid 1234 tid 100106 td 0xc4f5c440
      kdb_enter_why(c082d9e9,c082d9e9,c082c4e6,f3c28abc,0,…) at kdb_enter_why+0x3a
      panic(c082c4e6,c0832f87,c082af39,d6,f3c28b0c,…) at panic+0x12c
      _mtx_assert(cfd5f088,14,c082af39,d6,c08c2474,…) at _mtx_assert+0xbe
      _lockmgr(cfd5f058,3002,cfd5f088,c4f5c440,c083a064,…) at _lockmgr+0x88
      ffs_lock(f3c28b78,4,1002,1002,cfd5f000,…) at ffs_lock+0x91
      VOP_LOCK1_APV(c088f3a0,f3c28b78,c083a064,327,cfd5f088,…) at VOP_LOCK1_APV+0xa5
      _vn_lock(cfd5f000,1002,c4f5c440,c083a064,242,…) at _vn_lock+0xf8
      vn_write(c519d828,f3c28c60,c50c7900,0,c4f5c440,…) at vn_write+0x15b
      dofilewrite(f3c28c60,ffffffff,ffffffff,0,c519d828,…) at dofilewrite+0x95
      kern_writev(c4f5c440,4,f3c28c60,8e23000,116bb,…) at kern_writev+0x58
      write(c4f5c440,f3c28cfc,c,f3c28ccc,c08708e0,…) at write+0x4f
      syscall(f3c28d38) at syscall+0x2b3
      Xint0x80_syscall() at Xint0x80_syscall+0x20
      — syscall (4, FreeBSD ELF32, write), eip = 0x281b5573, esp = 0xbfbfc0cc, ebp = 0xbfbfc0e8 —

• I managed to track down the problem. One other symptom was UFS filesystem corruption on the same system including g_vfs_done errors on UFS filesystems, which started shortly after ZFS was enabled and used on that server. Disabling powerd solved the instability problems. I had powerd running on a number of systems however on this one server, an AMD Sempron 3000+, ZFS issues ensued. The AMD Athalon X2 4200+ (dual processor), a 1.5 GHz Celeron, and a hyperthreaded 2.4 GHz P4 had no problems whatsoever with this configuration. Powerd does not work well with ZFS under some circumstances.

• Another panic but only on the testbed. The testbed is using a debug kernel. The other significant difference is that I nullfs mount /usr/local, /usr/compat, /var/lib, /var/db/ports, /var/db/rarian, and /var/db/pkg from the ZFS filesystem (to be able to test various ports and ports configurations). Directories from ZFS filesystems mounted on top of UFS filesystems using nullfs should be investigated.

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