sorry, forgot to cc. Am Mittwoch, 27. April 2011 schrieb Dave Chinner: > On Tue, Apr 26, 2011 at 09:44:04PM +0200, Benjamin Schindler wrote: > > Hi > > > > Since upgrading to newer kernels I have serious problems with xfs > > performance on my root fs. > > It runs on a software raid 0 with 2 disks. On the same two disks, > > there are two more partitions running a software raid-1 with ext3. > > On the ext3 system, I have no issue, so I assume the drives are > > fine. > > But on the xfs filesystem, extracting a linux kernel archive takes 5 > > minutes or more, running ldconfig similarily long. The harddrives are > > sata-2. > > I'm running gentoo linux with kernel 2.6.38-gentoo-r1. I'm attaching > > the kernel config but I guess more info is needed - just let me know > > what is needed. > > more than likely your problem is that barriers have been enabled for > MD/DM devices on the new kernel, and they aren't on the old kernel. > XFS uses barriers by default, ext3 does not. Hence XFS performance > will change while ext3 will not. Check dmesg output when mounting > the filesystems on the different kernels. But didn't 2.6.38 replace barriers by explicit flushes the filesystem has to wait for - mitigating most of the performance problems with barriers? -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
