I am experiencing massive performance degradation on my BTRFS root
partition on SSD. Except for regular daily updates, nothing changed in
the system. The mount point remained the same:
/ btrfs rw,noatime,compress=lzo,ssd,space_cache,autodefrag 0 0
but the performance dropped to less than 8% of norm.
Before:
# dd if=tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 1.57307 s, 683 MB/s
Now:
# dd if=tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 26.4373 s, 40.6 MB/s
I created a new btrfs partition on the SSD with the same mount options
and it is not being affected:
# dd if=/mnt/er/tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 1.57634 s, 681 MB/s
I also did
btrfs filesystem balance start /
wit no effect.
I tried changing mount options - still no effect.
I'd appreciate some suggestions.
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