Ubuntu
linux package

  1. Bug #500069
  2. Comment #815

Comment 815 for bug 500069

Revision history for this message
In , iam (iam-linux-kernel-bugs) wrote :

>CONFIG_BLK_WBT=y
># CONFIG_BLK_WBT_SQ is not set
>CONFIG_BLK_WBT_MQ=y

So writeback throttling is enabled only for multi queue devices in your case. I suppose you need to use blk-mq for your sd* devices to activate writeback throttling (scsi_mod.use_blk_mq=1 boot flag) or to recompile kernel with CONFIG_BLK_WBT_SQ enabled.