From: Ian Thurlbeck Subject: Re: Strange delays on NFS server Date: Mon, 16 Aug 2004 13:40:38 +0100 Sender: nfs-admin@lists.sourceforge.net Message-ID: <4120AB46.1080606@stams.strath.ac.uk> References: <4119FB15.7010205@stams.strath.ac.uk> <411A17F2.2060203@RedHat.com> <411A448D.3080205@stams.strath.ac.uk> <20040811164135.GA11101@suse.de> <411B8987.1030609@stams.strath.ac.uk> <411CD601.1080308@RedHat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Cc: nfs@lists.sourceforge.net Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1BwgnC-0008I9-KI for nfs@lists.sourceforge.net; Mon, 16 Aug 2004 05:40:50 -0700 Received: from vif-img1.cc.strath.ac.uk ([130.159.248.61] helo=khafre.cc.strath.ac.uk) by sc8-sf-mx2.sourceforge.net with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.34) id 1BwgnB-0005Rr-Os for nfs@lists.sourceforge.net; Mon, 16 Aug 2004 05:40:50 -0700 Received: from dunnet.stams.strath.ac.uk ([130.159.240.95]:50211) by khafre.cc.strath.ac.uk with smtp (Exim 4.20 #1) id 1Bwgn0-0004vz-61 for ; Mon, 16 Aug 2004 13:40:38 +0100 To: Steve Dickson In-Reply-To: <411CD601.1080308@RedHat.com> Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: Steve Dickson wrote: > > > Ian Thurlbeck wrote: > >> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND >> 6365 root 16 0 1244 1244 880 R 0.9 0.2 0:15 0 top >> 156 root 15 0 0 0 0 DW 0.0 0.0 25:45 0 kjournald >> 2021 root 15 0 0 0 0 DW 0.0 0.0 17:38 0 nfsd >> 2037 root 15 0 0 0 0 DW 0.0 0.0 17:51 0 nfsd >> 2042 root 15 0 0 0 0 DW 0.0 0.0 17:07 0 nfsd >> 2044 root 15 0 0 0 0 DW 0.0 0.0 16:44 0 nfsd >> >> And then the bdflush process joins in and the number of nfsd processes >> grows, then shrinks back, and finally they all disappear. >> > Hmm... this is kinda what I expected... nfsd is waiting on the local > filesystem.... > Would it be nice if nfsd would know how to speak aio... but back to > reality..... > What happens if you double/triple (assuming you have enough memory) the > number nfsd > that are started? does it help or hurt? My guess is it probably will not > make a difference I bumped the nfsd's up to 64 (from 32) and subjectively the problem gets worse. I then reduced them to 16 and things are a bit better... Would changing some of the bdflush settings help at all? Thanks Ian -- Ian Thurlbeck http://www.stams.strath.ac.uk/ Statistics and Modelling Science, University of Strathclyde Livingstone Tower, 26 Richmond Street, Glasgow, UK, G1 1XH Tel: +44 (0)141 548 3667 Fax: +44 (0)141 552 2079 ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs