Date: Tue, 3 Jul 2018 17:32:45 +0100 From: Dave Hines <freebsd@dph.fluff.org> To: freebsd-questions@freebsd.org Subject: make startup delay in automounted NFS filesystem Message-ID: <20180703163245.GA26440@dph.fluff.org>
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I was using make in FreeBSD 11.2-RELEASE #0 r335510 to build a small
project, and noticed make pausing for almost 3 seconds every time it
started. Using truss I found that make was trying to find
".../share/mk" by searching up the filesystem from the current
directory, an extract of the truss output being:
stat("/net/192.168.31.252/mnt/z/home/dh/dph/src/login/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/z/home/dh/dph/src/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/z/home/dh/dph/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/z/home/dh/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/z/home/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/z/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/mnt/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
stat("/net/192.168.31.252/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
[ pause for almost 3 seconds here ]
stat("/net/share/mk",0x7fffffffd348) ERR#5 'Input/output error'
stat("/share/mk",0x7fffffffd348) ERR#2 'No such file or directory'
open("/usr/share/mk",O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC,057) = 3 (0x3)
I am using the automounter to NFS mount /mnt/z/home from a host on a
local ethernet with the address 192.168.31.252.
The delay appears to be caused by the attempt to lookup /net/share/mk,
which the automounter will see as looking for /mk on host share. As
there is no such host the mount attempt fails after a few seconds.
As a work-around, I created a symbolic link on the fileserver:
ln -s /usr/share /net/192.168.31.252/mnt/z/home/dh/share
and confirmed that this eliminated the delay. I don't like this, as it
is an absolute link on the fileserver, pointing to a local directory
on this host. From other hosts the link will be invalid. Is there a
better way of avoiding this delay ?
Should make use a different search strategy, or perhaps be aware of
the automounter when searching for share/mk ?
Regards -- Dave Hines.
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