XPost: alt.os.linux   
   From: p_d_a_s_i_l_v_a_ns@nonetnoaddress.pt   
      
   Às 04:39 de 15/07/22, Andrei Z. escreveu:   
   > Paulo da Silva wrote:   
   >> Às 03:16 de 14/07/22, Paulo da Silva escreveu:   
   >>> Hi!   
   >>>   
   >>> I have a USB external backup volume with btrfs.   
   >>> The backup script is a simple cp -al   followed by a   
   >>> rsync to update .   
   >>>   
   >>> The cp -al took 10-20 mins. in kernel 5.13 and before that.   
   >>> Now, with 5.15, without any changes, it is taking a few hours!!   
   >>>   
   >>> NOTES:   
   >>> I have noticed that before, during the cp -al there were outputs to   
   >>> the memory cache during which we could "visit" the drive followed by   
   >>> periods of flushing where a simple attempt to change to another dir   
   >>> took a while (sometimes ~1 min).   
   >>>   
   >>> Now, I can always navigate inside the drive without any delay when cp   
   >>> -al is in course! It seems like there is no memory cache although the   
   >>> memory cache still grows and shrinks.   
   >>>   
   >>> BTW, my mount command is   
   >>> mount /dev/mapper/TEMP /mnt1 -onoatime,compress-force=zstd   
   >>>   
   >>> There is an encryption layer below the fs.   
   >>>   
   >> There must be something very wrong with this 5.15 btrfs in kubuntu 20.04!   
   >> cp -al is more than 16 times faster in 5.13 (btrfs+luks+usb)!!   
   >   
   > btrfs is under active development   
   > https://btrfs.wiki.kernel.org/index.php/Changelog   
   >   
   Because of its features I am using it since the I was unable to   
   jeopardize the fs. Never had such issue.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)