[Samba] A samba locking question
abartlet at samba.org
Sat Jan 31 00:24:32 GMT 2004
On Thu, 2004-01-29 at 23:55, Patrik Gustavsson wrote:
> Maybe this is a stupid question, but any way
> Will samba use fcntl locking if level 1 and 2 oplocks is
> disabled and samba is not compiled with spin-locks enabled ?
> I am using Samba on solaris
Samba uses fcntl() locking in two places. Firstly, it is used to mirror
SMB locks, asked for by the client. Secondly they are used to mediate
access to tdbs.
Spinlocks are an alternative (if much less reliable) method for tdb
oplocks do not override fcntl locks - but clients that have successfully
gained an oplock might not ask for an SMB lock, and therefore Samba
might not attempt to gain the matching fcntl() lock.
The nasty performance issues in Solaris are due to bad fcntl() lock
contention performance in Samba's TDB access.
Andrew Bartlett abartlet at pcug.org.au
Manager, Authentication Subsystems, Samba Team abartlet at samba.org
Student Network Administrator, Hawker College abartlet at hawkerc.net
http://samba.org http://build.samba.org http://hawkerc.net
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