Hi,
I upgraded to linux-4.2.3 and btrfs-progs-4.2.3 yesterday, and wow,
there must have been bigger between linux-4.1.10 and 4.2.3 than were
mentioned in the changelog! I've been testing btrfs on a Thinkpad X200
with an i5-2450M, Intel 320 SSD, and 8GB of RAM for over a year now,
since when when linux-3.16 and btrfs-progs-3.17 were very new.
Performance had been steadily degrading, or hit or miss (I'm not sure if
defrag or fstrim actually work...), but stability was getting better.
The regular use case I use a benchmark is how fast the backup goes. If
the numbers seem unusual, I'll reboot and run:
tar cf- /.snapshots/only_one_snapshot | pv -pabet > /dev/null
then reboot and run
btrfs send /.snapshots/only_one_snapshot | pv -pabet > /dev/null
The worst run I've seen this last year for both of these commands~60
MiB/s throughput to /dev/null...
A year ago, when the file system was brand new, after I filled the fs
with my regular data, the average was:
GNU tar: ~125 MiB/s
BSD tar: ~129 MiB/s
btrfs send: ~140 MiB/s
Now with linux-4.2.3 and btrfs-progs-4.2.3:
GNU tar: ~134 MiB/s
BSD tar: ~129 MiB/s
btrfs send: ~133 MiB/s
This is the first time a backup has run at the speed of a fresh
filesystem; I have not recently run fstrim or btrfs fi defrag, so I was
very pleasantly surprised! Thank you all very much for your hard work.
Kind regards,
Nicholas
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
