On Mon, 2010-08-09 at 13:45 -0700, Konstantin Svist wrote: > On 08/09/2010 12:36 PM, Patrick O'Callaghan wrote: > > I've been copying some large (several GB) files from my local system to > > a NAS server on my LAN, using NFS. > > > > The local files are on an external USB drive (Iomega 500GB unit) on a > > USB 2 port. The NAS server is also Iomega, an ix-200. The network switch > > is a Belkin Wireless G with 100Mbps Ethernet ports (I'm not using Wifi > > for this). I'm not using jumbo frames or anything fancy, in fact I don't > > think the Belkin supports them. The system is an Intel Core 2 Duo mobo > > with 4GB RAM running F13 fully updated. > > > > I'm using KDE 4.4.5. When I do one of these copies (using cp from a > > terminal), my entire system becomes unresponsive for periods of about 1 > > minute, then becomes usable for maybe 10 seconds, freezes again for > > another minute etc. etc. until the copy finishes. "Unresponsive" means > > the mouse cursor won't move, button clicks aren't attended to and I > > can't type in Konsole or in the Evolution mail composer. > > > > Copying the same files to a local SATA disk doesn't cause this > > phenomenon, so it can't just be the external drive. OTOH, I use the same > > NAS for regular rsync-based backups *to the same NFS-mounted NAS* and > > the load is not noticeable. > > > > Any thoughts on this would be welcome. > > > > poc > > Usually you see this kind of problem when your HDD is thrashing. > > Try running your copy command with ionice: > ionice -c3 <command> OK, I tried that with a 1.2GB file. The mouse didn't freeze but I still couldn't do anything for long periods, as before. > Other things to check: > * run top in a separate window before you run the freezing command -- > see what it says when it works It freezes :-) i.e. it fails to update the status except every minute or so. When it does update, I can see the load average going up (over 4 in this case, on a more or less idle system). CPU wasn't being saturated or anything. > * see if tty sessions in Ctrl+Alt+F2..F6 respond any better than the UI Also frozen. poc -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
