Ubuntu
linux package

  1. Yakkety (16.10)
  2. Bug #1518457
  3. Comment #203

Comment 203 for bug 1518457

Revision history for this message
In , Wilhelm.Buchmueller (wilhelm.buchmueller-linux-kernel-bugs) wrote :

4.8.13-100.fc23.i686+PAE #1
/dev/sda is Samsung SSD 850 EVO 250GB

swapoff -va
sysctl vm.drop_caches=3

Problem, causes always heavy kswapd0 load:
  cat /dev/sda >> /dev/zero
  hdparm -t /dev/sda
  ddrescue /dev/sda /dev/zero -vf
  hexdump /dev/sda
  dd if=/dev/sda of=/dev/zero
  etc.

No problem (read speed ~500MB/s, except hdparm ):
  hdparm --direct -t /dev/sda
  dd iflag=direct if=/dev/sda of=/dev/zero bs=1073741824
  ddrescue --direct /dev/sda /dev/zero -vf -b 4096 -c 8192