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From: Chris Mason <clm@fb.com>
To: "hkbakke@gmail.com" <hkbakke@gmail.com>
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Subject: Re: Blocket for more than 120 seconds
Date: Mon, 16 Dec 2013 18:33:33 +0000
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On Mon, 2013-12-16 at 19:22 +0100, Hans-Kristian Bakke wrote:
> I have explicitly set compression=lzo, and later noatime just to test
> now, else it's just default 3.12.4 options (or 3.13-rc2 when I tested
> that).
> 
> To make sure, here is my btrfs mounts from /proc/mounts:
> /dev/sdl /btrfs btrfs rw,noatime,compress=lzo,space_cache 0 0
> /dev/sdl /storage/storage-vol0 btrfs rw,noatime,compress=lzo,space_cache 0 0
> 
> /etc/fstab:
> UUID=9302fc8f-15c6-46e9-9217-951d7423927c   /btrfs  btrfs
> defaults,compress=lzo,noatime           0   2
> UUID=9302fc8f-15c6-46e9-9217-951d7423927c   /storage/storage-vol0
> btrfs   defaults,subvol=storage-vol0,noatime    0   2
> 
> Hardware:
> CPU: Intel Xeon X3430 (Quad Core)
> MB: Supermicro X8SI6-F
> RAM: 16GB (4x4GB) Samsung ECC/Unbuffered DDR3 1333mhz CL9 (MEM-DR340L-SL01-EU13)
> HDDs in btrfs RAID10: 8 x Western Digital Se 4TB 64MB 7200RPM SATA
> 6Gb/s (WD4000F9YZ)
> HBAs: LSI SAS 9211-8i, LSI SAS 9201-16i
> 

Ok, could you please capture the dmesg output after a sysrq-w during one
of the stalls during rsync writing?  We want to see all the stack traces
of all the waiting procs.

Defrag is a slightly different use case, so I want to address that
separately.

-chris

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