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Date:      Mon, 11 Jan 1999 11:37:59 -0800 (PST)
From:      Matthew Jacob <mjacob@feral.com>
To:        Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
Cc:        Mike Smith <mike@smith.net.au>, alpha@FreeBSD.ORG
Subject:   Re: complete lockup under large I/O?
Message-ID:  <Pine.LNX.4.04.9901111135470.18573-100000@feral-gw>
In-Reply-To: <19990111164950Z.simokawa@sat.t.u-tokyo.ac.jp>

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Well, I tried with the BRK option but it still hung and wouldn't drop into
DDB.

Last top line shown:

last pid:   331;  load averages:  0.00,  0.00,  0.00    up 0+00:08:36  11:18:31
22 processes:  1 running, 21 sleeping
CPU states:  0.1% user,  0.0% nice,  6.3% system,  0.0% interrupt, 93.6% idle
Mem: 12M Active, 6352K Inact, 10M Wired, 3448K Buf, 217M Free
Swap: 300M Total, 300M Free

  PID USERNAME PRI NICE  SIZE    RES STATE    TIME   WCPU    CPU COMMAND
  251 root       2   0  3320K  1120K select   0:00  0.34%  0.34% rlogind
  331 root      -6   0  3184K  2064K physst   0:02  2.05%  0.20% rdsame
  101 root       2 -12  3680K  1320K select   1:46  0.00%  0.00% xntpd
  191 root       2   0  3320K  1120K select   0:22  0.00%  0.00% rlogind
  278 mjacob    28   0  6176K  1592K RUN      0:08  0.00%  0.00% top

Last iostat:

  0  237 63.86  88  5.51   0  0  1  0 99
   0   80 64.00  80  5.01   0  0  1  0 99
   0  169 63.87  98  6.12   0  0  1  0 99
   0  116 64.00 160 10.03   0  0  1  0 99
   0  381 63.89 235 14.69   0  0  4  0 96

Last from my test script:

Read 67108864 bytes in 6.388087 seconds, 10259.10KB/sec in 262144 byte blocks
Read 67108864 bytes in 4.262204 seconds, 15376.08KB/sec in 524288 byte blocks
Read 67108864 bytes in 3.281589 seconds, 19970.81KB/sec in 1048576 byte blocks


So, clearly some other evil deadlock has occurred.



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