From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleg Drokin Subject: Re: Copy time comparison 2.4.20-pre6 <-> 2.4.19+data-logging (was:Compatibility of current 2.4.19.pending ...) Date: Tue, 17 Sep 2002 18:00:35 +0400 Message-ID: <20020917180035.A15755@namesys.com> References: <3D7FDEA5.7040806@mb.tu-ilmenau.de> <3D81076E.6090408@mb.tu-ilmenau.de> <20020913113735.A6022@namesys.com> <3D826FB9.7030909@mb.tu-ilmenau.de> <20020914130239.D26664@namesys.com> <3D867C14.5060404@mb.tu-ilmenau.de> <20020917103321.C25766@namesys.com> <3D87347D.8030504@mb.tu-ilmenau.de> Mime-Version: 1.0 Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com Content-Disposition: inline In-Reply-To: <3D87347D.8030504@mb.tu-ilmenau.de> List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Manuel Krause Cc: reiserfs-list Hello! On Tue, Sep 17, 2002 at 03:56:13PM +0200, Manuel Krause wrote: > >>not?! I calculated these values manually based upon the timings & df > >>values after copying. Yes, I want to show my personal engagement for the > >>reiserfs community, too. > >Hm. Are you sure you are hitting write-speed limit? > >May be you are read-speed bounded? Can you please check that? > How can I check this? E.g. with some dd process? I just don't know. Copy same amount of data from RAM/nowhere to FS. E.g. make a file with file names and sizes and write a script that writes this amount of data from /dev/zero with these same names and needed sizes into FS. (or just use RAMFS as your source if you have not much data and huge RAM) Compare 2.4.20-pre[67] if you see any difference. Ah, also copy your data from original disk location to /dev/null and measure time of that operation to know how much of total time is occupied by reads. Also you can calculate read and write throughput separately this way. And if reads are slower than writes - ... Bye, Oleg