From: "Andrew Theurer" Subject: Re: Re: [PATCH] zerocopy NFS for 2.5.36 Date: Fri, 18 Oct 2002 10:12:12 -0500 Sender: nfs-admin@lists.sourceforge.net Message-ID: <004d01c276bb$39b32980$2a060e09@beavis> References: <001301c275e6$f31d5970$2a060e09@beavis><20021018.012618.74755132.taka@valinux.co.jp> <20021018.161952.41628057.taka@valinux.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Cc: , , , Return-path: Received: from mg03.austin.ibm.com ([192.35.232.20]) by usw-sf-list1.sourceforge.net with esmtp (Exim 3.31-VA-mm2 #1 (Debian)) id 182Yyx-0006Bg-00 for ; Fri, 18 Oct 2002 08:24:11 -0700 To: , "Hirokazu Takahashi" Errors-To: nfs-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Unsubscribe: , List-Archive: > > > Congestion avoidance mechanism of NFS clients might cause this > > > situation. I think the congestion window size is not enough > > > for high end machines. You can make the window be larger as a > > > test. > > > > The congestion avoidance window is supposed to adapt to the bandwidth > > that is available. Turn congestion avoidance off if you like, but my > > experience is that doing so tends to seriously degrade performance as > > the number of timeouts + resends skyrockets. > > Yes, you must be right. > > But I guess Andrew may use a great machine so that the transfer rate > has exeeded the maximum size of the congestion avoidance window. > Can we determin preferable maximum window size dynamically? Is this a concern on the client only? I can run a test with just one client and see if I can saturate the 100Mbit adapter. If I can, would we need to make any adjustments then? FYI, at 115 MB/sec total throughput, that's only 2.875 MB/sec for each of the 40 clients. For the TCP result of 181 MB/sec, that's 4.525 MB/sec, IMO, both of which are comfortable throughputs for a 100Mbit client. Andrew Theurer ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs