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
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