XPost: alt.os.linux   
   From: p_d_a_s_i_l_v_a_ns@nonetnoaddress.pt   
      
   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)!!   
      
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