Messages in this thread | | | Date | Wed, 8 Jan 2003 05:03:03 +0100 | From | Jakob Oestergaard <> | Subject | Re: More tests [Was: Problem with read blocking for a long time on /dev/scd1] |
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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.
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