On Wednesday, April 29, 2015 9:42:43 AM PDT, Mike Galbraith wrote:
[dbench bakeoff] With dbench v4.00, tux3 seems to be king of the max_latency hill, but btrfs took throughput on my box. With v3.04, tux3 took 1st place at splashing about in pagecache, but last place at dbench -S. Hohum, curiosity satisfied.
Hi Mike, Thanks for that. Please keep in mind, that was our B team, it does a full fs sync for every fsync. Maybe a rematch when the shiny new one lands? Also, hardware? It looks like a single 7200 RPM disk, but it would be nice to know. And it seems, not all dbench 4.0 are equal. Mine doesn't have a -B option. That order of magnitude latency difference is striking. It sounds good, but what does it mean? I see a smaller difference here, maybe because of running under KVM. Your results seem to confirm the gap I noticed between Ext4 and XFS on the one hand and Btrfs and Tux3 on the other, with the caveat that the anomalous dbench -S result is probably about running with the older fsync code. Of course, this is just dbench, but maybe something to keep an eye on. Regards, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
