Date: Sun, 26 May 1996 13:14:03 -0700 (PDT) From: Paul Traina <pst@Shockwave.COM> To: dyson@freebsd.org Cc: current@freebsd.org, pst@precipice.shockwave.com Subject: biodone w/current kernel & diskless operation Message-ID: <199605262014.NAA16620@precipice.shockwave.com>
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John,
I was playing around with a completely diskless system today running wiht
a -current kernel as of 8am this morning (Sunday).
I'm seeing very reproducable "biodone: buffer already done" messages.
When this happens, the current process usually hangs, the rest of the
system seems to operate just fine.
I just switched to an alternate terminal and did a ps axlwww in case this
helps. The process that's interesting is the vi (which is what I was
doing when the system wigged). The vi session itself seemed to keep
working just fine, and I was even able to write out my file, but when
I went to exit the process, everything hung for that terminal. It
seems there's something going on in the vm system that causes the biodone
message and screws up the process spindown.
There are a couple of vi processes in the same state, because I've had
two terminals hang since booting.
This is trivial for me to reproduce, so please feel free to ask me to
do further debugging. I've got DDB int the kernel if we get desparate.
Again, of special note: this machine is swapping and has NFS running
over the net. The swapfile was created as suggested in the manual,
by using "touch swap.<address>" as opposed to actually creating a 20k
block swap file with DD. no swapon commands were done on the diskless
machine because I apparently don't have the right syntax. In any
case the diskless machine has 16mb of ram and I was doing stuff that
should not have gotten us anywhere close.
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
0 0 0 0 -18 0 0 0 sched DLs ?? 0:00.00 (swapper)
0 1 0 0 10 0 408 208 wait Is ?? 0:00.02 /sbin/init --
0 2 0 0 -18 0 0 12 psleep DL ?? 0:00.00 (pagedaemon)
0 3 0 0 28 0 0 12 psleep DL ?? 0:00.00 (vmdaemon)
0 4 0 0 28 0 0 12 update DL ?? 0:00.01 (update)
0 41 1 0 2 0 312 128 sbwait Ss ?? 0:00.01 rdisc -s
0 62 1 0 2 0 196 476 select Ss ?? 0:00.16 syslogd
1 75 1 7 2 0 176 452 select Is ?? 0:00.00 portmap
0 85 1 0 10 0 216 96 nfsidl S ?? 0:00.11 nfsiod -n 4
0 86 1 0 10 0 216 96 nfsidl I ?? 0:00.02 nfsiod -n 4
0 87 1 0 10 0 216 96 nfsidl I ?? 0:00.01 nfsiod -n 4
0 88 1 0 10 0 216 96 nfsidl I ?? 0:00.01 nfsiod -n 4
0 91 1 0 2 0 196 548 select Is ?? 0:00.19 inetd
0 102 1 0 18 0 236 560 pause Is ?? 0:00.02 cron
0 106 1 6 2 0 196 536 select Is ?? 0:00.02 lpd
0 109 1 15 2 0 500 852 accept Is ?? 0:00.01 sendmail: accepting connections (sendmail)
0 162 1 0 -18 0 520 980 vmopar D p0- 0:00.23 vi /etc/XF86Config
0 146 1 0 18 0 464 304 pause Is v0 0:00.15 -csh (csh)
0 170 146 0 28 0 520 996 - T v0 0:00.28 vi /etc/XF86Config
0 184 146 0 -18 0 508 960 vmopar D+ v0 0:00.08 vi /etc/XF86Config
0 147 1 1 18 0 464 308 pause Ss v1 0:00.12 -csh (csh)
0 190 147 2 28 0 460 244 - R+ v1 0:00.01 ps -axlwww
0 148 1 0 3 0 168 556 ttyin Is+ v2 0:00.02 /usr/libexec/getty Pc ttyv2
/a/export/quemadura/swap/:
total 0
-rw-r--r-- 1 root wheel 0 May 26 10:13 swap.171.69.108.35
vmstat:
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr f0 w0 in sy cs us sy id
0 2 0 156 2620 12 0 1 0 10 0 0 0 122 64 17 0 1 98
pstat -s
Device 1K-blocks Used Avail Capacity Type
/dev/?? 20000 0 19936 0% Interleaved
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