There is an error in the syntax under the "low-latency IO-scheduler" section at the following URL (https://wiki.debian.org/SSDOptimization). The text reads:
"The default I/O scheduler queues data to minimize seeks on HDDs, which is not necessary for SSDs. Thus, use the deadline scheduler that just ensures bulk transactions won't slow down small transactions: Install sysfsutils and
(adjust sdX to match your SSD) reboot or..."
The syntax of the echo command should read as follows:
"echo "block/sdX/queue/scheduler = deadline" >> /etc/sysfs.conf"
Note the change of the periods (.) to forward slashed (/)
I verified this in debian testing after applying the SSD optimizations.
Patrick M. Sullivan