Date: Sat, 23 Aug 2003 16:02:50 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Kirk McKusick <mckusick@McKusick.COM> Cc: Paul Saab <ps@yahoo-inc.com> Subject: Re: mksnap_ffs, snapshot issues, again Message-ID: <Pine.BSF.4.21.0308231601290.684-100000@InterJet.elischer.org> In-Reply-To: <200308230832.h7N8Wcol050681@beastie.mckusick.com>
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Would it not be possible to make the snapshot file not appear in a
directory until it si finished? (I know that would be 'wierd'
but it would give a "guaranteed" solution..
On Sat, 23 Aug 2003, Kirk McKusick wrote:
> Robert Watson forwarded your posting to me as I am not as current
> on current as I should be.
>=20
> ---------- Forwarded message ----------
> > Date: Mon, 18 Aug 2003 22:38:47 +0200
> > From: "[iso-8859-2] Branko F. Gra=E8nar" <bfg@noviforum.si>
> > To: freebsd-current@freebsd.org
> > Subject: mksnap_ffs, snapshot issues, again
> >=20
> > I have 900G array on a promise sx6000 controller
> >=20
> > This is freshly formatted filesystem (newfs -L export -O 2 -U -g 48000 =
-i 2048 -m 0 -o space /dev/pst0s2d)
> >=20
> > # df -i /export
> > /dev/pst0s2d 778742004 216194 778525810 0% 2 445159292 0% =
/export
> >=20
> > # mount | grep export
> > /dev/pst0s2d on /export (ufs, local, soft-updates)
> >=20
> > let's try to create a snapshot of empty filesystem
> >=20
> > # cd /export
> > # mksnap_ffs /export aaa.snap
> >=20
> > ... after 30 minutes ... snapshot was not created (!!! On a empty
> > filesystem !!!)... Ok, long snapshot creation would be fine if it
> > would not hang all processes, which would like to do something on
> > /export (ls /export for example.). Filesystem cannot be unmounted.
> > mksnap_ffs process cannot be killed. Reboot and foreground fsck
> > helps.
> >
> > This is 5.1-RELEASE (without patches, with custom kernel -> just picked=
up generic kernel and removed uneeded stuff.)....
> >=20
> > Any ideas, why is this happening? As i mentioned before, this prevents =
background fsck to make his job done (machine hangs.)
> >=20
> >=20
> > I would really like to solve this issue....
> >=20
> > Brane
>=20
> ------------ Discussion -----------------
>=20
> Paul Saab kindly arranged a machine (tank.freebsd.org) with a 2Tb
> disk array on it for me to test. I enclose a copy of the `sysctl kern'
> output at the end of this message. I first ran my own test which
> involved creating a default configuration filesystem, taking a
> snapshot, and removing the snapshot. The scripted result is below.
> It shows that it takes 48 minutes to create the snapshot and 15
> minutes to remove it. But importantly, it shows that the filesystem
> is only locked down and inaccessible for 0.042 seconds of that 48
> minutes. The problem is that the 77,000 indirect blocks needed by
> the snapshot do not fit in the 300 kernel buffers allotted to it.
> So, every indirect block needs to be read and written approximately
> three times. Just to be sure that there was not something weird about
> your configuration, I also ran the same set of tests using your
> newfs parameters. Other than creating more cylinder groups the
> result (e.g., running time) was about the same.
>=20
> But, to get to the problem that you are having with accessing your
> filesystem. The problem is that although the filesystem is only
> locked briefly, the snapshot file is locked for the entire 48 minutes.
> Thus, if you touch the snapshot file (by for example doing a "stat"
> on it), then the process doing the stat will hang for 48 minutes.
> The next process to try and touch the snapshot will lock /export
> while it waits for the lock on the snapshot to clear. And at that
> point you are hosed for 48 minutes on all access to /export :-(
> So, I think that the best solution for you would be to try creating
> a hidden directory for the snapshot file, e.g., create a /export/.snap
> directory mode 700 owned by root, then create the snapshot as say
> /export/.snap/snap1. This way, it will be out of the way of all
> snoopy programs except those walking the filetree as root.
>=20
> =09Kirk McKusick
>=20
> ------------ Results of my test -----------------
>=20
> Script started on Fri Aug 22 17:18:34 2003
>=20
> tank# newfs /dev/twed0
> /dev/twed0: 2097152.0MB (4294967292 sectors) block size 16384, fragment s=
ize 2048
> using 11413 cylinder groups of 183.77MB, 11761 blks, 23552 inodes=
=2E
> super-block backups (for fsck -b #) at:
> 160, 376512, 752864, 1129216, 1505568, 1881920, 2258272, 2634624, 301097=
6,
> 3387328, 3763680, 4140032, 4516384, 4892736, 5269088, 5645440, 6021792,
> 6398144, 6774496, 7150848, 7527200, 7903552, 8279904, 8656256, 9032608,
> 9408960, 9785312, 10161664, 10538016, 10914368, 11290720, 11667072, 1204=
3424,
> 12419776, 12796128, 13172480, 13548832, 13925184, 14301536, 14677888,
> 15054240, 15430592, 15806944, 16183296, 16559648, 16936000, 17312352,
> 17688704, 18065056, 18441408, 18817760, 19194112, 19570464, 19946816,
> 20323168, 20699520, 21075872, 21452224, 21828576, 22204928, 22581280,
>=20
> < etc, etc, etc >
>=20
> 4283638624, 4284014976, 4284391328, 4284767680, 4285144032, 4285520384,
> 4285896736, 4286273088, 4286649440, 4287025792, 4287402144, 4287778496,
> 4288154848, 4288531200, 4288907552, 4289283904, 4289660256, 4290036608,
> 4290412960, 4290789312, 4291165664, 4291542016, 4291918368, 4292294720,
> 4292671072, 4293047424, 4293423776, 4293800128, 4294176480, 4294552832,
> 4294929184
>=20
> tank# dumpfs /dev/twed0 | head -22
> magic 19540119 (UFS2) time Sat Aug 23 01:18:55 2003
> superblock location 65536 id [ 3f47236f d612c37d ]
> ncg 11413 size 1073741823 blocks 1039959213
> bsize 16384 shift 14 mask 0xffffc000
> fsize 2048 shift 11 mask 0xfffff800
> frag 8 shift 3 fsbtodb 2
> minfree 8% optim time symlinklen 120
> maxbsize 16384 maxbpg 2048 maxcontig 8 contigsumsize 8
> nbfree 129994899 ndir 1 nifree 268798973 nffree 2=
0
> bpg 11761 fpg 94088 ipg 23552
> nindir 2048 inopb 64 maxfilesize 140806241583103
> sbsize 2048 cgsize 16384 csaddr 3000 cssize 184320
> sblkno 40 cblkno 48 iblkno 56 dblkno 3000
> cgrotor 0 fmod 0 ronly 0 clean 1
> flags none
> fsmnt =20
> volname swuid 0
>=20
> cs[].cs_(nbfree,ndir,nifree,nffree):
> (11373,1,23549,13) (11391,0,23552,0) (11391,0,23552,0) (11391,0,2=
3552,0)=20
> (11391,0,23552,0) (11391,0,23552,0) (11391,0,23552,0) (11391,0,23=
552,0)=20
> (11391,0,23552,0) (11391,0,23552,0) (11391,0,23552,0) (11391,0,23=
552,0)=20
>=20
> tank# ^ew^we
> tunefs -n enable /dev/twed0
> tunefs: soft updates set
>=20
> tank# mount /dev/twed0 /mnt
>=20
> tank# cd /mnt
>=20
> tank# df -i /mnt
> Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mo=
unted on
> /dev/twed0 2079918426 2 1913524950 0% 1 268798973 0% /m=
nt
>=20
> tank# df -i -g /mnt
> Filesystem 1G-blocks Used Avail Capacity iused ifree %iused Mounted =
on
> /dev/twed0 1983 0 1824 0% 1 268798973 0% /mnt
>=20
> tank# sysctl -w debug.collectsnapstats=3D1
> debug.collectsnapstats: 0 -> 1
>=20
> tank# mount -u -o snapshot snap1 /mnt
> 0.000u 51.055s 47:57.80 1.7% 522+253k 191899+286461io 0pf+0w
>=20
> tank# ls -lis /mnt/snap1
> 3 1232048 -r-------- 1 root wheel 2199023346984 Aug 22 17:06 snap1
>=20
> tank % df /mnt
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/twed0 2079918426 1232050 1912292902 0% /mnt
>=20
> tank# rm -f snap1
> 0.000u 8.084s 14:39.67 0.9% 506+275k 65567+65536io 0pf+0w
>=20
> tank# egrep suspended /var/log/messages | tail -1
> Aug 22 18:04:02 tank kernel: /mnt: suspended 0.042 sec, redo 0 of 11413
>=20
> tank# exit
>=20
> Script done on Fri Aug 22 19:21:00 2003
>=20
> ------------ Results of your test -----------------
>=20
> Script started on Fri Aug 22 23:52:19 2003
>=20
> tank# newfs -L export -O 2 -U -g 48000 -i 2048 -m 0 -o space /dev/twed0
> /dev/twed0: 2097152.0MB (4294967292 sectors) block size 16384, fragment s=
ize 2048
> using 17642 cylinder groups of 118.88MB, 7608 blks, 60864 inodes.
> with soft updates
> super-block backups (for fsck -b #) at:
> 160, 243616, 487072, 730528, 973984, 1217440, 1460896, 1704352, 1947808,
> 2191264, 2434720, 2678176, 2921632, 3165088, 3408544, 3652000, 3895456,
> 4138912, 4382368, 4625824, 4869280, 5112736, 5356192, 5599648, 5843104,
> 6086560, 6330016, 6573472, 6816928, 7060384, 7303840, 7547296, 7790752,
> 8034208, 8277664, 8521120, 8764576, 9008032, 9251488, 9494944, 9738400,
> 9981856, 10225312, 10468768, 10712224, 10955680, 11199136, 11442592, 116=
86048,
> 11929504, 12172960, 12416416, 12659872, 12903328, 13146784, 13390240,
> 13633696, 13877152, 14120608, 14364064, 14607520, 14850976, 15094432,
>=20
> < etc, etc, etc >
>=20
> 4287016864, 4287260320, 4287503776, 4287747232, 4287990688, 4288234144,
> 4288477600, 4288721056, 4288964512, 4289207968, 4289451424, 4289694880,
> 4289938336, 4290181792, 4290425248, 4290668704, 4290912160, 4291155616,
> 4291399072, 4291642528, 4291885984, 4292129440, 4292372896, 4292616352,
> 4292859808, 4293103264, 4293346720, 4293590176, 4293833632, 4294077088,
> 4294320544, 4294564000, 4294807456
>=20
> tank# dumpfs /dev/twed0 | head -22
> magic 19540119 (UFS2) time Fri Aug 22 23:52:39 2003
> superblock location 65536 id [ 3f470f37 1d9cb87a ]
> ncg 17642 size 1073741823 blocks 939239037
> bsize 16384 shift 14 mask 0xffffc000
> fsize 2048 shift 11 mask 0xfffff800
> frag 8 shift 3 fsbtodb 2
> minfree 0% optim space symlinklen 120
> maxbsize 16384 maxbpg 2048 maxcontig 8 contigsumsize 8
> nbfree 117404877 ndir 1 nifree 1073762685 nffree 2=
0
> bpg 7608 fpg 60864 ipg 60864
> nindir 2048 inopb 64 maxfilesize 140806241583103
> sbsize 2048 cgsize 16384 csaddr 7664 cssize 282624
> sblkno 40 cblkno 48 iblkno 56 dblkno 7664
> cgrotor 0 fmod 0 ronly 0 clean 1
> flags soft-updates=20
> fsmnt =20
> volname export swuid 0
>=20
> cs[].cs_(nbfree,ndir,nifree,nffree):
> (6631,1,60861,13) (6655,0,60864,0) (6655,0,60864,0) (6655,0,60864=
,0)=20
> (6655,0,60864,0) (6655,0,60864,0) (6655,0,60864,0) (6655,0,60864,=
0)=20
> (6655,0,60864,0) (6655,0,60864,0) (6655,0,60864,0) (6655,0,60864,=
0)=20
>=20
> tank# mount /dev/twed0 /mnt
>=20
> tank# cd /mnt
>=20
> tank# df -i /mnt
> Filesystem 1K-blocks Used Avail Capacity iused ifree %iused M=
ounted on
> /dev/twed0 1878478074 2 1878478072 0% 1 1073762685 0% /=
mnt
>=20
> tank# df -i -g /mnt
> Filesystem 1G-blocks Used Avail Capacity iused ifree %iused Mounted=
on
> /dev/twed0 1791 0 1791 0% 1 1073762685 0% /mnt
>=20
> tank# sysctl debug.collectsnapstats
> debug.collectsnapstats: 1
>=20
> tank# set time
>=20
> tank# mount -u -o snapshot /mnt/snap1 /mnt
> load: 0.00 cmd: mount 3908 [biord] 0.00u 49.03s 0% 360k
> load: 0.07 cmd: mount 3908 [physrd] 0.00u 49.30s 0% 360k
> 0.000u 57.064s 47:55.13 1.9% 526+255k 222815+300336io 0pf+0w
>=20
> tank# ls -lis /mnt/snap1
> 3 1331856 -r-------- 1 root wheel 2199023396864 Aug 23 00:43 /mnt/snap=
1
>=20
> tank# df /mnt
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/twed0 1878478074 1331858 1877146216 0% /mnt
>=20
> tank# rm -f snap1
> 0.000u 8.180s 10:25.82 1.3% 505+240k 65567+65536io 0pf+0w
>=20
> tank# egrep suspended /var/log/messages | tail -1
> Aug 23 00:15:30 tank kernel: /mnt: suspended 0.027 sec, redo 0 of 17642
>=20
> tank# exit
>=20
> Script done on Sat Aug 23 00:54:41 2003
>=20
> ------------ sysctl kern output -----------------
>=20
> kern.ostype: FreeBSD
> kern.osrelease: 5.1-CURRENT
> kern.osrevision: 199506
> kern.version: FreeBSD 5.1-CURRENT #0: Thu Aug 21 02:11:29 PDT 2003
> ps@tank.freebsd.org:/usr/src/sys/i386/compile/TANK
> kern.maxvnodes: 70264
> kern.maxproc: 6164
> kern.maxfiles: 12328
> kern.argmax: 65536
> kern.securelevel: -1
> kern.hostname: tank.freebsd.org
> kern.hostid: 0
> kern.clockrate: { hz =3D 100, tick =3D 10000, profhz =3D 1024, stathz =3D=
128 }
> kern.posix1version: 200112
> kern.ngroups: 16
> kern.job_control: 1
> kern.saved_ids: 0
> kern.boottime: { sec =3D 1061550694, usec =3D 491116 } Fri Aug 22 04:11:3=
4 2003
> kern.domainname: freebsd
> kern.osreldate: 501105
> kern.bootfile: /boot/kernel/kernel
> kern.maxfilesperproc: 11095
> kern.maxprocperuid: 5547
> kern.ipc.maxsockbuf: 262144
> kern.ipc.sockbuf_waste_factor: 8
> kern.ipc.somaxconn: 128
> kern.ipc.max_linkhdr: 16
> kern.ipc.max_protohdr: 40
> kern.ipc.max_hdr: 56
> kern.ipc.max_datalen: 152
> kern.ipc.nmbclusters: 25600
> kern.ipc.nmbufs: 51200
> kern.ipc.nmbcnt: 32256
> kern.ipc.nsfbufs: 6656
> kern.ipc.mbuf_wait: 64
> kern.ipc.mbuf_hiwm: 512
> kern.ipc.mbuf_lowm: 128
> kern.ipc.clust_hiwm: 128
> kern.ipc.clust_lowm: 16
> kern.ipc.maxpipekva: 10485760
> kern.ipc.maxpipekvawired: 5242880
> kern.ipc.pipes: 2
> kern.ipc.bigpipes: 0
> kern.ipc.pipekva: 32768
> kern.ipc.pipekvawired: 0
> kern.ipc.msgmax: 16384
> kern.ipc.msgmni: 40
> kern.ipc.msgmnb: 2048
> kern.ipc.msgtql: 40
> kern.ipc.msgssz: 8
> kern.ipc.msgseg: 2048
> kern.ipc.semmap: 30
> kern.ipc.semmni: 10
> kern.ipc.semmns: 60
> kern.ipc.semmnu: 30
> kern.ipc.semmsl: 60
> kern.ipc.semopm: 100
> kern.ipc.semume: 10
> kern.ipc.semusz: 92
> kern.ipc.semvmx: 32767
> kern.ipc.semaem: 16384
> kern.ipc.shmmax: 33554432
> kern.ipc.shmmin: 1
> kern.ipc.shmmni: 192
> kern.ipc.shmseg: 128
> kern.ipc.shmall: 8192
> kern.ipc.shm_use_phys: 0
> kern.ipc.numopensockets: 23
> kern.ipc.maxsockets: 25600
> kern.dummy: 0
> kern.ps_strings: 3217031152
> kern.usrstack: 3217031168
> kern.logsigexit: 1
> kern.iov_max: 1024
> kern.cam.scsi_delay: 15000
> kern.cam.cd.changer.min_busy_seconds: 5
> kern.cam.cd.changer.max_busy_seconds: 15
> kern.cam.da.retry_count: 4
> kern.cam.da.default_timeout: 60
> kern.random.sys.seeded: 1
> kern.random.sys.burst: 20
> kern.random.sys.harvest.ethernet: 1
> kern.random.sys.harvest.point_to_point: 1
> kern.random.sys.harvest.interrupt: 1
> kern.random.sys.harvest.swi: 0
> kern.random.yarrow.gengateinterval: 10
> kern.random.yarrow.bins: 10
> kern.random.yarrow.fastthresh: 192
> kern.random.yarrow.slowthresh: 256
> kern.random.yarrow.slowoverthresh: 2
> kern.disks: twed0 ad2 ad0
> kern.geom.debugflags: 0
> kern.geom.collectstats: 1
> kern.elf32.fallback_brand: -1
> kern.init_path: /sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall
> kern.acct_suspend: 2
> kern.acct_resume: 4
> kern.acct_chkfreq: 15
> kern.cp_time: 6158 0 148996 17012 17783789
> kern.openfiles: 69
> kern.kq_calloutmax: 4096
> kern.stackprot: 7
> kern.ps_arg_cache_limit: 256
> kern.ps_argsopen: 1
> kern.lastpid: 3850
> kern.randompid: 0
> kern.ktrace.genio_size: 4096
> kern.ktrace.request_pool: 100
> kern.module_path: /boot/kernel;/boot/modules
> kern.malloc:=20
> Type InUse MemUse HighUse Requests Size(s)
> twe commands 255 16K 32K 266 64,512,8192,16384
> ISOFS mount 1 256K 256K 1
> atkbddev 2 1K 1K 2 32
> isadev 21 2K 2K 21 64
> GEOM 116 12K 83K 6174 16,32,64,128,256,512,1024,65=
536
> nexusdev 3 1K 1K 3 16
> memdesc 1 4K 4K 1 4096
> VM pgdata 2 65K 65K 2 64,65536
> pfs_fileno 1 32K 32K 1 32768
> pfs_nodes 20 3K 3K 20 128
> UFS mount 26 379K 711K 41 64,256,2048,4096,8192
> UFS ihash 1 256K 256K 1
> UFS dirhash 69 13K 13K 69 16,32,64,128,256,512
> dirrem 0 0K 1K 1011 32
> mkdir 0 0K 1K 2 32
> diradd 0 0K 1K 1045 32
> freefile 0 0K 1K 175 32
> freeblks 0 0K 5K 161 256
> freefrag 0 0K 1K 40 32
> allocindir 0 0K 329K 154001 64
> indirdep 0 0K 52K 22901 32,16384
> allocdirect 0 0K 3K 313 128
> bmsafemap 0 0K 53K 149301 32
> newblk 1 1K 1K 154315 64,256
> inodedep 1 256K 265K 1369 128,256
> pagedep 1 32K 33K 227 64,32768
> p1003.1b 1 1K 1K 1 16
> NFS daemon 1 1K 1K 1 256
> NFS hash 1 256K 256K 1
> NFS req 0 0K 1K 2240 64
> syncache 1 8K 8K 1 8192
> tseg_qent 0 0K 1K 2 32
> in_multi 2 1K 1K 2 32
> routetbl 38 6K 6K 96 16,32,64,128,256
> lo 1 1K 1K 1 512
> clone 1 4K 4K 1 4096
> ether_multi 7 1K 1K 7 16,32,64
> ifaddr 21 6K 6K 21 32,256,512,2048
> BPF 3 1K 1K 3 128
> mount 19 7K 7K 26 16,32,128,512
> MSDOSFS mount 1 128K 128K 1
> vnodes 25 6K 6K 153 16,32,64,128,256
> cluster_save buffer 0 0K 1K 1 64
> vfscache 1 512K 512K 1
> BIO buffer 2 4K 185K 100 1024,2048
> pcb 21 5K 5K 1730 16,32,64,2048
> soname 5 1K 1K 594269 16,32,128
> ptys 2 1K 1K 2 512
> ttys 1110 143K 156K 2790 128,512
> shm 1 16K 16K 1 16384
> sem 4 7K 7K 4 1024,4096
> msg 4 25K 25K 4 512,4096,16384
> ioctlops 0 0K 1K 331 512,1024
> DEVFS 107 17K 18K 217 16,32,128,4096
> ATA generic 4 2K 2K 4 16,512
> MD sectors 4 16K 16K 80 4096
> taskqueue 3 1K 1K 3 128
> MD disk 8 2K 2K 160 16,256
> acpidev 55 1K 1K 55 16
> sbuf 0 0K 33K 2205 16,32,64,128,256,512,1024,20=
48,4096,8192,16384
> rman 115 8K 8K 481 64
> acpisem 17 3K 3K 17 64,128
> acpitask 0 0K 1K 2 16,32
> mbufmgr 102 135K 135K 102 32,64,256,8192,16384
> acpica 965 53K 54K 10560 16,32,64,128,256,512,1024,20=
48
> kobj 97 388K 388K 97 4096
> eventhandler 31 2K 2K 31 32,128
> devstat 12 25K 25K 12 16,4096
> bus 609 42K 133K 4434 16,32,64,128,256,512,1024,20=
48,4096,16384,32768
> SWAP 2 549K 549K 2 64
> sysctltmp 0 0K 2K 21688 16,32,64,128,256,512,2048
> sysctloid 125 4K 4K 125 16,32,64
> sysctl 0 0K 1K 973 16,32,64
> uidinfo 6 2K 2K 143 32,1024
> cred 26 4K 5K 9207 128
> subproc 85 292K 328K 4251 256,4096
> proc 2 8K 8K 2 4096
> session 20 3K 3K 409 128
> pgrp 24 3K 4K 698 128
> mtx_pool 1 8K 8K 1 8192
> module 147 10K 10K 149 64,128
> temp 7 117K 117K 7384 16,32,64,128,256,512,1024,20=
48,4096,8192,32768
> devbuf 142 855K 905K 131522 16,32,64,128,256,512,1024,20=
48,4096,16384
> lockf 9 1K 1K 877 32,64
> linker 33 93K 98K 103 16,32,256,1024,2048,4096,163=
84,65536
> AR driver 1 1K 3K 5 64,256,2048
> KTRACE 100 13K 13K 100 128
> ithread 41 4K 4K 41 64,128
> zombie 0 0K 1K 3779 128
> proc-args 25 2K 2K 17589 16,32,64,128,256
> kqueue 6 6K 10K 193053 256,1024
> kenv 109 6K 6K 110 16,32,64,2048
> sigio 1 1K 1K 1 32
> file desc 71 18K 26K 3960 256,2048
> dev_t 147 37K 37K 147 256
> AD driver 2 1K 2K 21823 64,512
> ATA DMA 2 1K 1K 2 64
>=20
> kern.ident: TANK
> kern.maxusers: 384
> kern.fallback_elf_brand: -1
> kern.kstack_pages: 2
> kern.uarea_pages: 1
> kern.sync_on_panic: 1
> kern.shutdown.poweroff_delay: 5000
> kern.shutdown.kproc_shutdown_wait: 60
> kern.sugid_coredump: 0
> kern.coredump: 1
> kern.corefile: %N.core
> kern.fscale: 2048
> kern.timecounter.nbinuptime: 35881781
> kern.timecounter.nnanouptime: 3
> kern.timecounter.nmicrouptime: 3883
> kern.timecounter.nbintime: 245389
> kern.timecounter.nnanotime: 34
> kern.timecounter.nmicrotime: 245355
> kern.timecounter.ngetbinuptime: 0
> kern.timecounter.ngetnanouptime: 3087
> kern.timecounter.ngetmicrouptime: 2181958
> kern.timecounter.ngetbintime: 0
> kern.timecounter.ngetnanotime: 0
> kern.timecounter.ngetmicrotime: 7012364
> kern.timecounter.nsetclock: 3
> kern.timecounter.hardware: ACPI-fast
> kern.timecounter.choice: TSC(-100) ACPI-fast(1000) i8254(0) dummy(-100000=
0)
> kern.timecounter.tick: 1
> kern.timecounter.smp_tsc: 0
> kern.threads.debug: 0
> kern.threads.max_threads_per_proc: 150
> kern.threads.max_groups_per_proc: 50
> kern.threads.max_threads_hits: 0
> kern.threads.virtual_cpu: 4
> kern.quantum: 100000
> kern.ccpu: 1948
> kern.devstat.numdevs: 3
> kern.devstat.generation: 1738
> kern.devstat.version: 6
> kern.kobj_methodcount: 58
> kern.log_wakeups_per_second: 5
> kern.log_console_output: 1
> kern.msgbuf:=20
> kern.msgbuf_clear: 0
> kern.smp.active: 1
> kern.smp.disabled: 0
> kern.smp.cpus: 4
> kern.smp.forward_signal_enabled: 1
> kern.smp.forward_roundrobin_enabled: 1
> kern.nselcoll: 0
> kern.drainwait: 300
> kern.tty_nin: 3131
> kern.tty_nout: 368061
> kern.console: ttyd0,/ttyd0,consolectl,
> kern.consmute: 0
> kern.consmsgbuf_size: 8192
> kern.constty_wakeups_per_second: 5
> kern.rootdev: ad0s1a
> kern.filedelay: 30
> kern.dirdelay: 29
> kern.metadelay: 28
> kern.minvnodes: 17566
> kern.chroot_allow_open_directories: 1
> _______________________________________________
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