Do not forget the finite number of writes SSDs have. For instance I would keep /temp out of the SSD. ----- Original Message ----- Sergio Augusto Vladisauskis wrote: > Look this topic: http://thessdreview.com/Forums/linux/225-post2940.htm#post2940 > I using Fedora 17 with this options. > > PS: my logs put in other HD. > Always good to get another view, however I would like to see a better explanation of what those changes do before just telling people to do them (him, not you). in no order: deadline scheduler works for SSD (and most types of RAID) but I did't see any big gain so I general l don't bother. Having /tmp be really temporary can lead to having to find a better place to put stuff you need for a few days, and putting it in RAM requires enough memory to match what you would use on disk. In my case that's a few GB, but everyone has a different idea of what it should do, so understand the results before you decide faster is always better. I want to test what setting fifo_batch is going to do before I comment on that. There is no such value in RHEL5 or FC17 on my machines: ls -lG /sys/block/sda/queue/iosched/ total 0 -rw-r--r--. 1 root 4096 Jan 22 13:38 back_seek_max -rw-r--r--. 1 root 4096 Jan 22 13:38 back_seek_penalty -rw-r--r--. 1 root 4096 Jan 22 13:38 fifo_expire_async -rw-r--r--. 1 root 4096 Jan 22 13:38 fifo_expire_sync -rw-r--r--. 1 root 4096 Jan 22 13:38 group_idle -rw-r--r--. 1 root 4096 Jan 22 13:38 low_latency -rw-r--r--. 1 root 4096 Jan 22 13:38 quantum -rw-r--r--. 1 root 4096 Jan 22 13:38 slice_async -rw-r--r--. 1 root 4096 Jan 22 13:38 slice_async_rq -rw-r--r--. 1 root 4096 Jan 22 13:38 slice_idle -rw-r--r--. 1 root 4096 Jan 22 13:38 slice_sync -rw-r--r--. 1 root 4096 Jan 22 13:38 target_latency so I want to go look at the kernel code and description to see what that does and what side effects it might have. Changing the elevator=deadline option on the kernel command line will change it for all drives, not just the SSD. That may really not what you want for performance on non-RAID drives. The techniques are good to know, but I hope people do understand the side effects of some of these things. -- Bill Davidsen <davidsen@xxxxxxx> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
