Re: Massive BTRFS performance degradation

2014-03-09 Thread Swâmi Petaramesh
Le dimanche 9 mars 2014 08:48:20 KC a écrit : I am experiencing massive performance degradation on my BTRFS root partition on SSD. BTW, is BTRFS still a SSD-killer ? It had this reputation a while ago, and I'm not sure if this still is the case, but I don't dare (yet) converting to BTRFS one

Re: Massive BTRFS performance degradation

2014-03-09 Thread Swâmi Petaramesh
Le dimanche 9 mars 2014 11:01:17 vous avez écrit : This ThinkPad T520 has been with BTRFS since installation of the Debian sid system on it with Kernel 2.6.39 or even 2.6.38 (where Sandybridge graphics didn´t work so well as today yet). So that much to any FUD about BTRFS and SSDs. Wow !

Re: Massive BTRFS performance degradation

2014-03-09 Thread Hugo Mills
On Sun, Mar 09, 2014 at 11:23:29AM +0100, Swâmi Petaramesh wrote: Le dimanche 9 mars 2014 11:01:17 vous avez écrit : This ThinkPad T520 has been with BTRFS since installation of the Debian sid system on it with Kernel 2.6.39 or even 2.6.38 (where Sandybridge graphics didn´t work so well as

Re: Massive BTRFS performance degradation

2014-03-09 Thread Martin Steigerwald
Am Sonntag, 9. März 2014, 11:33:50 schrieb Hugo Mills: On Sun, Mar 09, 2014 at 11:23:29AM +0100, Swâmi Petaramesh wrote: Le dimanche 9 mars 2014 11:01:17 vous avez écrit : This ThinkPad T520 has been with BTRFS since installation of the Debian sid system on it with Kernel 2.6.39 or even

Re: Massive BTRFS performance degradation

2014-03-09 Thread Swâmi Petaramesh
Le dimanche 9 mars 2014 11:33:50 Hugo Mills a écrit : ssd should be activated automatically on any non-rotational device. ssd_spread is generally slower on modern SSDs than the ssd option. discard is, except on the very latest hardware, a synchronous command (it's a limitation of the SATA

Re: Massive BTRFS performance degradation

2014-03-09 Thread boris
Swâmi Petaramesh swami at petaramesh.org writes: Actually deduplication WAS the reason why I recently made the move to BTRFS again, for deduplication in ZFS is working, but *SO* memory hungry and performance killer unless you have *lots* of RAM... If you think about what dedup is has to

Re: Massive BTRFS performance degradation

2014-03-09 Thread Austin S Hemmelgarn
On 03/09/2014 04:17 AM, Swâmi Petaramesh wrote: Le dimanche 9 mars 2014 08:48:20 KC a écrit : I am experiencing massive performance degradation on my BTRFS root partition on SSD. BTW, is BTRFS still a SSD-killer ? It had this reputation a while ago, and I'm not sure if this still is the

Re: Massive BTRFS performance degradation

2014-03-09 Thread Tobias Holst
2014-03-09 18:36 GMT+01:00 Austin S Hemmelgarn ahferro...@gmail.com: On 03/09/2014 04:17 AM, Swâmi Petaramesh wrote: Le dimanche 9 mars 2014 08:48:20 KC a écrit : I am experiencing massive performance degradation on my BTRFS root partition on SSD. BTW, is BTRFS still a SSD-killer ? It had

Massive BTRFS performance degradation

2014-03-08 Thread KC
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%