On Sun, 26 Jun 2011, Ted Ts'o wrote: > On Sun, Jun 26, 2011 at 12:33:16PM -0500, Mccauliff, Sean D. (ARC-PX)[Lockheed Martin Space OPNS] wrote: > > Sorry if this is not the correct mailing list for ext4 questions. > > -ext3-users, +linux-ext4 > > > I'm copying terabytes of data from an ext3 file system to a new ext4 > > file system. I'm seeing high CPU usage from the processes > > flush-253:2, kworker-3:0, kworker-2:2, kworker-1:1, and kworker-0:0. > > Does anyone on the list have any idea what these processes do, why > > they are consuming so much cpu time and if there is something that > > can be done about it? This is using Fedora 15. > > You're using Fedora 15, so you're using a 2.6.38 kernel, right? > > How are you copying the files? Are you using cp? rsync? NFS? CIFS? > > what sort of files are you copying? Are they large files, many of > small files? Are there lots of hard links? etc. > > - Ted Also, how high is high CPU usage ? Is ext4lazyinit thread running (ps aux | grep ext4lazyinit) ? If it is could you try to mount it with '-o noinit_itable' mount option to see if it helps ? Thanks! -Lukas -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
