Eric Sandeen wrote: > (note: times & rates look wrong to me, something is up with blktrace I > think, but FIBMAP shouldn't lie about allocation) CONFIG_NO_HZ was causing this... here are better graphs: http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write.png http://people.redhat.com/esandeen/seekwatcher/xfs-dd-write.png http://people.redhat.com/esandeen/seekwatcher/ext4-xfs-dd-write.png http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write-odirect.png http://people.redhat.com/esandeen/seekwatcher/xfs-dd-write-odirect.png http://people.redhat.com/esandeen/seekwatcher/ext4-xfs-dd-write-odirect.png -Eric - 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