XPost: alt.os.linux   
   From: no-email@invalid.invalid   
      
   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   
      
   --- SoupGate-Win32 v1.05   
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