Re: More tests [Was: Problem with read blocking for a long time on /dev/scd1]

Jakob Oestergaard (jakob@unthought.net)
Wed, 8 Jan 2003 05:03:03 +0100

On Mon, Dec 23, 2002 at 03:58:02AM -0500, Greg Stark wrote:
> Jakob Oestergaard <jakob@unthought.net> writes:
>
...
> When your process is blocked, what wait channel does ps -elf list for it?
> What system call does strace -T show it executing and for how long?

On the NFS server, knfsd and kupdated will block on "wait_on_b" (WCHAN
in top).

I guess an strace on the NFS client would just show the process waiting
in some open/read/write/close code, waiting for NFS/RPC. Not much good.

The hangs last for approximately 5 seconds, sometimes around 10.

-- 
................................................................
:   jakob@unthought.net   : And I see the elder races,         :
:.........................: putrid forms of man                :
:   Jakob Østergaard      : See him rise and claim the earth,  :
:        OZ9ABN           : his downfall is at hand.           :
:.........................:............{Konkhra}...............:
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