Hi, could you strace your imapd process ? Please add the -T option to print the time the process spent in the system calls. -Mark On Friday 21 November 2008 17:46:00 Achievement Chan wrote: > Hello, > I will change my production system to ext3 for solving the performance > problem. Actually, I have tried GFS2 in testing server and found > performance can be improved to a acceptable level (response within 2 > seconds) > > However, it still not stable for production system.... and I can't > wait until RHEL 5.3 release... > > 2008/11/13 Kadlecsik Jozsef <kadlec@xxxxxxxxxxxxxxx>: > > Hello, > > > > On Wed, 12 Nov 2008, Achievement Chan wrote: > >> For handling a mailbox with 10000 email, it takes 6-8 seconds for > >> waiting response from first "SELECT" command. > >> The response time is also unstable too, sometimes it takes 10-20 > >> seconds for the same mailbox. > >> > >> Based some online material, i've tried to tune the gfs. But there are > >> seems no improvement. > >> e.g. > >> gfs_tool setflag inherit_jdata /home/domains > >> gfs_tool settune /home/domains recoverd_secs 60 > >> gfs_tool settune /home/domains glock_purge 50 > >> gfs_tool settune /home/domains demote_secs 100 > >> gfs_tool settune /home/domains scand_secs 3 > >> gfs_tool settune /home/domains max_readahead 262144 > >> gfs_tool settune /home/domains statfs_fast 1 > >> > >> Has anyone tried to provide imap service in GFS? > > > > We have had exactly the same problems with maildir over GFS. There was no > > tuning whatsoever which helped: the fighting for the locks for every > > file in the maildir costs so much that you cannot expect better > > performance. > > > > The best is to avoid maildir and use simple mailbox format instead. We > > went (back) to mailbox and since then our users have not complained about > > performance. > > > > Best regards, > > Jozsef > > -- > > E-mail : kadlec@xxxxxxxxxxxx, kadlec@xxxxxxxxxxxxxxxxx > > PGP key: http://www.kfki.hu/~kadlec/pgp_public_key.txt > > Address: KFKI Research Institute for Particle and Nuclear Physics > > H-1525 Budapest 114, POB. 49, Hungary > > > > -- > > Linux-cluster mailing list > > Linux-cluster@xxxxxxxxxx > > https://www.redhat.com/mailman/listinfo/linux-cluster > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Gruss / Regards, Dipl.-Ing. Mark Hlawatschek http://www.atix.de/ http://www.open-sharedroot.org/ ** ATIX Informationstechnologie und Consulting AG Einsteinstr. 10 85716 Unterschleissheim Deutschland/Germany -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
