On Monday 16 July 2007 14:22:25 David Chinner wrote: > You can see from the ext3 graph that it comes to a screeching halt > every 5s (probably when pdflush runs) and at all other times the > seek rate is >10,000 seeks/s. That's pretty bad for a brand new, > empty filesystem and the only way it is sustained is the fact that > the disks have their write caches turned on. ext4 will probably show > better results, but I haven't got any of the tools installed to be > able to test it.... I recently did some filesystem throuput tests, you may find it here http://www.pci.uni-heidelberg.de/tc/usr/bernd/downloads/lustre/performance/ ldiskfs is ext3+extents+mballoc+some-smaller-patches, so is almost ext4 (delayed allocation is still missing, but the clusterfs/lustre people didn't port it and I'm afraid of hard to detect filesystem corruptions if I include it myself). Write performance is still slower than with xfs and I'm really considering to try to use xfs in lustre. Cheers, Bernd -- Bernd Schubert Q-Leap Networks GmbH - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
