Messages in this thread |  | | | Date | Thu, 16 Sep 2010 16:33:04 +0200 | | From | Rogier Wolff <> | | Subject | Sudden "hangs".... |
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Hi,
It seems my home workstation hangs on a "mkdir" once every morning for about half a minute. It'll freeze whatever I'm doing and continue happily 30 seconds later, but I can't figure out what's going on because it's frozen...
My server did it just now and I was able to grab some more debugging info..... obelix:~> time mkdir /recover3/testdir 0.000u 0.004s 2:11.83 0.0% 0+0k 0+0io 5pf+0w obelix:~> Over two minutes to make a directory! (I have the impression that the wait is for something to finish, so if I had started the mkdir a minute earlier, it would've taken a minute longer).
The process: 28649 root 20 0 0 0 0 D 6.3 0.0 0:11.69 flush-9:0
was in "top", and as shown here in "disk wait" mode.
While this is going on, "vmstat 1" shows:
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 1 5368 12764 324804 1616932 0 0 464 0 244 477 0 2 0 98 0 1 5368 12764 324556 1617168 0 0 448 0 255 474 0 1 0 99 0 1 5368 12764 324952 1616832 0 0 472 0 257 487 0 1 0 99 ... about 400 kbytes of IO per second. This is similar to the single-disk machine at home.
The server runs:
Linux version 2.6.34 (wolff@abra2) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #5 SMP Tue Jun 1 14:44:01 CEST 2010
at home I run: Linux version 2.6.28-19-generic (buildd@palmer) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #61-Ubuntu SMP Wed May 26 23:35:15 UTC 2010
Does anybody know what's going on?
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 ** ** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 ** *-- BitWizard writes Linux device drivers for any device you may have! --* Q: It doesn't work. A: Look buddy, doesn't work is an ambiguous statement. Does it sit on the couch all day? Is it unemployed? Please be specific! Define 'it' and what it isn't doing. --------- Adapted from lxrbot FAQ
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