Re: CONFIG_SCSI_MQ_DEFAULT cause slow direct write speed to usb stick

Hi, my problem was, that write speed to the device is got really slow from 7 Mb/s to 250 Kb/s, so 16.76 Mb/sec is probably the speed limitation of the uSD Card or is close to that. Do you activated blk-mq for scsi in kernel config or in boot parameters? Regards, Andrej On Tue, 10 Feb 2015 17:10:

CONFIG_SCSI_MQ_DEFAULT cause slow direct write speed to usb stick

Hi, i had found a problem with CONFIG_SCSI_MQ_DEFAULT config option. If it activated, then the write speeds to the /dev/sd* of an usb stick drops dramatically: it's only about 250 kb/CONFIG_SCSI_MQ_DEFAULTs, but should be about 7 Mb/s. Git bisect also points to commit 24c20f10583647e30afe87b6f6d5e