>
> >I'm using Ubuntu(16.04) desktop version (not server) running Xorg and
> >others. May be its possible its
> >flushing data to disk at constant time. If you like to give it a try again
> >with servers, below is the
> >exact script along with its timing & multiextent output.
>
> Archlinux
> >>How did you create the 2m file?
> >
> >Yes,this is the problem. script invokes 'dd' with 'notrunc' for each
> >byte. If the file is 1kb, 'dd' invoked 1024 times with notrunc.
> >This seems to be creating the issue.
>
> IIRC that's not the direct cause though.
>
> Since kernel is using
On Mon, Feb 20, 2017 at 03:53:15PM +0800, Qu Wenruo wrote:
>
>
> At 02/18/2017 10:07 AM, Lakshmipathi.G wrote:
> >Hi,
> >
> >With RAID5, using 3 loop-back devices each has 4GB. On a fresh setup,
> >created a 2mb file.
> >While checking no.of extents,it shows like:
> >
> ># ./btrfs-debugfs -f
Hi,
With RAID5, using 3 loop-back devices each has 4GB. On a fresh setup, created a
2mb file.
While checking no.of extents,it shows like:
# ./btrfs-debugfs -f /mnt/file2m.txt
(257 0): ram 110592 disk 145227776 disk_size 114688
(257 110592): ram 4096 disk 145461248 disk_size 4096
(257 114688):
