On Fri, 2 Oct 2015 10:07:24 PM Austin S Hemmelgarn wrote: > > ARC presumably worked better than the other Solaris caching options. It > > was ported to Linux with zfsonlinux because that was the easy way of > > doing it. > > Actually, I think part of that was also the fact that ZFS is a COW > filesystem, and classical LRU caching (like the regular Linux pagecache) > often does horribly with COW workloads (and I'm relatively convinced > that this is a significant part of why BTRFS has such horrible > performance compared to ZFS). Last time I checked a BTRFS RAID-1 filesystem would assign each process to read from one disk based on it's PID. Every RAID-1 implementation that has any sort of performance optimisation will allow a single process that's reading to use both disks to some extent. When the BTRFS developers spend some serious effort optimising for performance it will be useful to compare BTRFS and ZFS. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
